PASSENGER CAR AND TRUCK IDENTIFICATION-1983 MODELS

This bulletin has been prepared to assist in identifying 1983 model vehicles and components as described below:

SUBJECT PAGE

Vehicle Identification Number . . . . . . . . 2 - 4 Fisher Body Plate . . . . . . . . . . . . . . 5 Corvette Body Plate . . . . . . . . . . . . . 6 Light Duty Truck Service Parts Identification Sticker . . . . . . . . . . . . . . . . . . . 6 Engines . . . . . . . . . . . . . . . . . . . 7 - 13 Transaxles . . . . . . . . . . . . . . . . . 14 - 15 Transmissions . . . . . . . . . . . . . . . . 16 - 24 Axles . . . . . . . . . . . . . . . . . . . . 25 - 36

PASSENGER CAR VEHICLE IDENTIFICATION NUMBER

The vehicle identification number is visible through the windshield near the left door. On all passenger cars, except Corvette, it is stamped on a plate located on the instrument panel. On Corvettes, it is on the left windshield pillar.

LIGHT DUTY (10-30) TRUCK VEHICLE IDENTIFICATION NUMBER

"C", "G", "S" and El Camino trucks display the VIN plate on the left hand side of the instrument panel area. On P 42 models, the plate is attached to the top of the radiator support, and on Motor Home Chassis P 32, to the dash and toe panel.

MEDIUM DUTY TRUCK VEHICLE IDENTIFICATION NUMBER

On Conventional Cabs, the VIN plate is mounted on the left door lock pillar. On School Bus Chassis, the plate is attached to the engine side of the cowl. On P models, it is located on top of the radiator support panel.

On the Chevrolet, Malibu Classic, El Camino and Monte Carlo, the body identification plate is located on the upper horizontal surface of the cowl plenum chamber. The Cavalier, Celebrity, Camaro, Citation and Chevette plate is located on the upper horizontal surface of the radiator support.

CORVETTE BODY PAINT AND TRIM PLATE

The body paint and trim plate which is stamped with the trim, paint and time built codes is attached to the left door hinge pillar.

The time built code contains an alpha representing the month followed by two (2) numerics representing the day of the month. A is used for the first month, B for the second, etc. EXAMPLE: A21 (August 21st); B02 (September 2).

LIGHT DUTY TRUCK SERVICE PARTS IDENTIFICATION STICKER

A Service Parts Identification Sticker is furnished for L.D. trucks except El Camino. It contains a complete listing of the vehicle identification number (VIN) wheel base and all production options used to assemble the vehicle, such as suspension, body equipment, engine, axle, transmission, tires, etc.

On "C", "K", "G" and "S" models, this sticker is attached to the inner glove compartment. For "P" models, it is mailed separately to the dealer. On "G" models, the sticker is located on the inner hood panel surface.

PASSENGER CAR ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines will be stamped with a source, production date and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

EXAMPLE:

V 12 10 DWB - -- -- --- ENGINE MONTH DAY ENGINE SOURCE PRODUCED PRODUCED CODE ------ -------- -------- ---- K=GM of Canada 12th Month 10th Day Chevrolet F=Flint Motor December 1.6L (98 CID) T=Tonawanda L4 V=Flint Engine M=GM of Mexico A=Ramos - Mexico

ENGINE CODE LOCATIONS

L4 1.6L

The code is stamped on a pad on the right side of the engine below the number one cylinder parallel to the cylinder case deck.

L4 1.8L

The engine production code and partial VIN are stamped on a horizontal surface of the block just rearward of the water pump.

L4 2.5L

The code is on a sticker placed on the timing gear cover and is also stamped on the block, water pump end, just below the cylinder head. This is a two letter alpha code indicating engine type.

V6 2.8L

The code is stamped on a horizontal machined surface on the block just forward of the intake manifold.

V6 3.8L 231 CID (Front Mounted Distributor)

Located on the front face of the left rocker on a paper label

V6 3.8L 229 CID (Rear Mounted Distributor)

Located on cylinder case pad immediately forward of the right cylinder head.

V8 5. 7L 350 CID (Diesel)

The code is on a label located on rear face of left valve cover.

V8 5.0L and 5.7L

Located on cylinder case pad immediately forward of the right cylinder head.

NOTE: In addition, all passenger car engines (except 3.8L 231 CID) will have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This condensed identification number consists of the division number, model year, assembly plant designation and vehicle build sequence number.

EXAMPLE:

1 D R 1 2 3 4 5 6 - - - ------------ Chevrolet Model Assembly Vehicle Passenger Year Plant Sequence (VIN Pos. 3) Number

1983 PASSENGER ENGINE CODES

DISPLACE. R.P.O. FEDERAL CALIFORNIA VEHICLE MENT AUTO. MANUAL AUTO. MAN. ------- ---- ------ ----- ------ ------ ----- T 1.6L L17 DWB, DWU, DWF, DWZ, DWB, DWU DWA, DWC CHEVETTE DWD, DWH DWC 1.8L LJ5 DJB, DJD DJA, DJC DJD DJC (DIESEL) DMT, DMR J 2.0L LQ5 DSB, DSA DJT, DJR DSB, DSA DMX, DMU CAVALIER DMZ DSS, DSN

A 2.5L LR8 YAA YAA CELEBRITY (TBI) 2.5L LU9 2.8L LE2 DCA, DCC DCA, DCC

X 2.5L LRB YAP YAL YAP YAL CITATION 2.8L LE2 DCD, DCH DCB,DCF DCD, DCH DCB, DCF 2.8L LH7 DFB, DFC DFA,DTB DFB, DFC DFA, DTB DTA, DTC DTA, DTC F 2.5L LQ9 YMT YBM, YMM YMT YBM, YMM CAMARO 2.8L LL1 DAB, DAD DAB, DAD 2.8L LC1 DAA,DAC 5.0L LGA DDW DDH 5.0L LU5 DUA DUJ (TBI) G 3.8L LC3 DBF, DBB, MT.CARLO DAB 3.8L LD5 NH 4.3L LT6 UMP, UMR, UMP, UMR, UMT, UMU, UMT, UMU, UMW, UMX UMW, UMX UKA, UKB UKA, UMX 5.0L LG4 DDF, DDD DDK, DDJ 5.7L LF9 VLB, VKZ, VKZ, VLA VLA 'B' 3.8L LC3 DBH, DBC, CHEVROLET DBD 3.8L LD5 NL 5.0L LG4 DDM, DDC DDB, DDS 5.7L LM1 DAR DAR

5.7L LF9 VRB, VKC, VKB, VKC VND, VMA, VMA, VMB, VMB VKD Y 5.7L L83 ZFC ZFD ZFF ZFN CORVETTE (TBI)

DISPLACE CANADA PRO. VEHICLE MENT AUTO. MAN. DIV. ------- ---- ---- ---- ----- T 1.6L D8A D8C, D8B CHEV. CHEVETTE D8D 1.8L IZ

J 2.0L D70 D7S, D7T CHEV. CAVALIER D7H D7A, D7B

A 2.5L CELEBRITY 2.5L YSS, YST PONT. 2.8L D2S, D2R CHEV.

X 2.5L YSZ, YTT YSY PONT. CITATION 2.8L D2M, D2K D2M, D2J CHEV. 2.8L CHEV.

F 2.5L YBS, YZZ YBY, YTY PONT. CAMARO 2.8L CHEV, 2.8L D6A, D6C D6B, D60 CHEV. 5.0L D5C D5B CHEV 5.0L

G 3.8L CHEV. MT.CARLO 3.8L BUICK 4.3L UMP, UMR, OLDS UMT, UMU, UMW, UMX UKA, UKB 5.0L D5F 5.7L CHEV.

'B' 3.8L CHEV. CHEVROLET 3.8L ND BUICK 5.0L D5R, D5D CHEV. 5.7L D6N CHEV. POLICE 5.7L VKB, VKC OLDS MKD, VMA VMB Y 5.7L CHEV. CORVETTE

TRUCK ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines, except 6.2L diesel will be stamped with a source, production date and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

EXAMPLE:

F 12 10 USC - -- -- ---

Source Month Day Engine Code Code Code Type

K=GM of Canada 12th Month 10th Day F=Flint Motor December T=Tonawanda V=Flint Engine M-GM of Mexico R=Moraine

NOTE: In addition, all 10-30 Series Trucks have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This identification number consists of the division code, model year, assembly plant designation and vehicle build sequence number.

EXAMPLE: C C F 1 2 3 4 5 6

The truck engine codes are located as follows:

L4 2.0L 112 CID Rear Wheel Drive

The code is stamped on a horizontal machined surface on the block left side just rearward of the exhaust manifold.

L6

The code is stamped on a pad on the right side of cylinder case just rear of the distributor.

V8

305, 350 CID Engines - the code is stamped on the cylinder case pad immediately forward of the right hand cylinder head.

366, 427, 454 CID Engines - the code is stamped on a pad on the front top center of the cylinder case immediately forward of the inlet manifold.

V8 Diesel

6.2L (379 Cu.In.) Identification label attached to rocker covers:

EXAMPLE:

10 UTW R 0004441 -- --- - -------

Engine Suffix Plant Build Assembly Code Sequence

For product reports use suffix, plant code and sequential number i.e. p UTWR 4441.

1983 LIGHT DUTY TRUCK ENGINE CODES

DISPLACE- R.P.O. FEDERAL CALIFORNIA VEHICLE MENT AUTO. MANUAL AUTO. MAN. ------- ---- ------ ---- ------ ------ ----- 1.95L LR1 UMB, UMC UMH, UMJ UMD, UMF S-10TRUCK UMK, UMM 2.0L LQ2 UKB, UKD UKC, UKF, UKX, UWB UKY, UWC 2.8L LR2 UNZ, UYY UNW, UYX UXK, UZM UXJ, UZK UNC, UYC UNA, UYB "T" 2.0L LQ2 UKM, UKW T-10TRUCK UWA, UKA 2.8L LR2 UXD, UZF UNR, UYD UXZ, UZW UXY, UZU UNS, UYF UXC, UZB C-K-P 4.8L L25 UTD UTC,UTB,UTA UTD UTC, UTB, UTA 10-30 4.1L LE3 UUN, UUS UUR, UUT UAM, UAR UAU, UAX L.D. TRUCK UAC, UAD, UAT, UAB, UAZ 5.0L LE9 UCB, UCJ, UCA, UCH, UCD, UDA, UDB UCF, UDD, UCT, UCU, UDC, UCK UCM, UCR 5.7L LS9 UHR, URK URF, URJ URC, URD, URA 5.7L LT9 USF, USA USC USH, USB USD 5.7L LF5 UFB, UFC UFA 7.4L LE8 UBA, UBC UBD, UBH UBA, UBC UBD,UBH 6.2L LH6 UHH, UHT UHB, UHA UHJ, UHK, UHC,UHD (DIESEL) UHN, UHW, UHF, UHS, UHM, UJU, UJM, UJN UJU, UTT, UJM, UJN, UJR, UTT UJR, UBT, UBS, UBU UFK, UBR "G" 4.3L LT6 UKA, UKB, 10-30 VAN UMW, UMX UMP, UMR UMT, UMU UKC, UMS 4.1L LE3 UAF, UAJ UUU, UUW, UAS, UAY UAK, UAN, UAW 5.7L LS9 URM, USJ URN, USN, USK 6.2L LL4 UHX, UFJ, UJA, UJZ UHR, UHZ UHY, UJA UJY, UHU UJZ, UJY, UJU, UTT UJU, UTT, UJR UJR "P" 5.7L LT9 USS, USX, USR, USW USU, USZ UST, USY 20-30 UUA, UUK UUM L.D.TRUCK USJ, USZ 6.2L LL4 UBN, UJB, UJB, UES, UJB, UFS, UJB, UFS, UFS, UJK, UJK, UFR, UJK, UFR UJK, UFR, UFR UBY, UTW, UTW, UFN UFN 7.4L LE8 UBB, UBB UBF

DISPLACE- CANADA PRO. VEHICLE MENT AUTO. MAN. DN. ------- ---- ----- ---- --- 1.95L IZU. S-10TRUCK 2.0L CHEV.

2.8L CHEV.

"T" 2.0L CHEV. T-10TRUCK 2.8L CHEV.

C-K-P 4.8L 10-30 4.1L L.D. TRUCK

5.0L

5.7L 5.7L 5.7L 7.4L 6.2L

"G" 4.3L 10-30 VAN

4.1L

5.7L

6.2L

"P" 5.7L 20-30 L.D.TRUCK 6.2L

7.4L

1983 MED. DUTY TRUCK ENGINE CODES

OPTION & ALL STATES CANADA DISPLACEMENT AUTO. MAN. AUTO. MAN. MANUF. ------------ ------ ---- ----- ---- ------ 6.00L UDA,UDC, UDB U8B,U8C U8A CHEV. L86 7.0L ADB,ADC ADA U7B,U7C U7A CHEV. L43

7.4 L UBA,UBB,UBC, UBD,UBH LE8 UBF

TRANSAXLE ASSEMBLY IDENTIFICATION INFORMATION

The manual and automatic transaxle each has its own code location and explanation.

MANUAL TRANSAXLE

Four-Speed 76MM

The code is stamped on a diagonal case surface directly beneath the clutch lever cable reaction bracket.

The Muncie 76mm stamp consists of two (2) alpha and three (3) numeric characters as shown below:

EXAMPLE:

X 3 A 04, - - - --- Mfg. Source Calendar Code Model Year Month Produced Day Produced ---- ---------- --------------- ------------- X = Muncie 3 = 1983 A=Jan. K=July 01 = 1st Day B=Feb. M=Aug. of Month C=Mar. P=Sept. 04 = 4th Day D=Apr. R=Oct. of Month E=May S=Nov. H=June T=Dec.

AUTOMATIC TRANSAXLE

THM 125C Three-Speed Automatic

The code is located on a stamped metal tag adjacent to the shifter shaft on the transaxle.

The THM 125C/440 T4 stamp consists of one (1) alpha and five (5) numeric characters as shown below. In addition, a sequence number is stamped below the date build code.

EXAMPLE:

83 V 205 -- - --- Model Year Vehicle Build Application Date* Code

83 CV 8711 -- -- ---- Model Year Vehicle Sequence Application Number Code

THM 440 T4 Four-Speed Automatic

The code is located on a stamped metal tag on the rear face of the transaxle case adjacent to right hand axle opening.

Canadian produced transaxles will start with source ID code, build date, model year code and engineering change level number.

EXAMPLE:

J 155 3CB S - --- --- - Mfg. Source Julian Model Year Eng. Change Code Date Code Level

PASSENGER CAR TRANSMISSION PRODUCTION CODE EXPLANATION

Manual Transmissions

Four-speed transmissions built at Chevrolet plants will carry a production code number. The code number identifies the source, model year, month and day produced.

The transmission codes are located as follows:

Four-Speed

The muncie (cast iron case) transmission (Saginaw type) is stamped on the machined surface of the left side of the case just below the side cover.

The Muncie 70mm (aluminum case) transmission is stamped on the bottom center front of case.

EXAMPLE:

K 3 R 03 - - - -- MODEL MONTH DAY SOURCE CODE YEAR PRODUCED PRODUCED ----------- ---- -------- ---------

A-January B-February C-March K = Muncie (Chevette, 70mm D-April 4-Speed) E-May H-June R = Muncie (Pass. 4-Speed- K-July Saginaw Type) M-August P-September R-October S-November T-December

Warner Gear Four and Five-Speed

The Warner Gear transmissions have the source code, model year, month, day and shift identification stamped at the upper left side of the metal tag attached to rear of the case on the upper right of the tag is their sequential serial number.

EXAMPLE:

W A 20 3 1 - - -- - - SHIFT SOURCE CODE MONTH DAY YEAR CODE ----------- ----- --- ---- ---- W = Warner A-Jan. G-July 20=20th 3 = Shift B-Feb. H-Aug. Day 1983 Produced C-Mar. J-Sept. D-Apr. K-Oct. E-May L-Nov. F-June M-Dec.

Four-Speed Manual With Automatic Overdrive (Doug Nash) MK2

Source part number and trade mark appear above speedo gear opening. No build code information.

Chevette Five-Speed Isuzu Transmission

Right side of transmission case at rear extension is a six digit ink stamp transmission serial number. On right side of bell housing at approximately 4:00 o'clock position, five digit ink stamp.

2 02 18 - -- -- Last Digit of Year Month Date

Five-Speed Isuzu Manual Transaxle (MY7)

On fifth gear cover ten (10) digit die stamped number.

2 05 15 0001 - -- -- -- ----- Last Digit of Year Inspection Month Inspection Date Blank Serial Number

Automatic Transmissions

Turbo Hydra-Matic 180C Automatic Transmission

The THM 180C automatic transmission code and transmission serial number appear on a metal tag fastened to the left side of the transmission just rearward of the converter housing.

Turbo Hydra-Matic 200C Automatic Transmission

The production code number contains the model year, vehicle application and build date code. The transmission model num- ber and sequence number is stamped below the build date code on an identification plate, located on the right side the transmission case.

EXAMPLE:

83 0 201 -- - --- 1983 Model Year Vehicle Build Code Application Code Code

In addition to the vehicle application and Julian build date code, Hydra-Matic Division also includes the model year, model and sequence number.

EXAMPLE:

83 CO 6697 -- -- ---- 1983 Model Year Chevrolet & Vehicle Sequence No. Application Code

BUILD DATE

The build date code starts with the Julian date (day of the year) on which 1983 production started. The build date code continues with the Julian date until December 31st (365).

Turbo Hydra-Matic 250C and 350C Automatic Transmissions

THM 250C and 350C transmissions produced by Chevrolet Parma and THM 350C transmission produced by Buick Motor Division have the production code stamped on the governor cover.

EXAMPLE:

B 3 D 10 D - - - -- - MODEL MONTH DAY SHIFT SOURCE CODE YEAR PRODUCED PRODUCED PRODUCED

B = Parma (THM 250C) 1983 A = Jan. 10th Day D = 1st B = Parma (THM 350C) B = Feb. N = 2nd C = March D = April E = May H = June K = July M = Aug. P = Sept. R = Oct. S = Nov. T = Dec.

THM 350C Transmission (Buick)

EXAMPLE:

JD 222 D 83 -- --- - -- Vehicle Application Build Date Shift Year D = 1st 1983 N = 2nd

The 700-R4 transmission produced by Chevrolet Toledo has a production code stamped on the right rear side of the pan rail.

EXAMPLE:

3 TA 222 D - -- --- - Model Year 1983 Vehicle Application Build Date Shift D = 1st N = 2nd

PASSENGER CAR TRANSMISSION IDENTIFICATION NUMBER FOR FOR "SERVICE" USAGE

The following system will be used to identify service transmission assemblies. This number system applies to domestically produced complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet). The second letter will indicate the type of unit "T" (transmission). The number following the letter will designate the model year - "3" (1983). The last five digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

PLANT SERIAL SEQUENCE ----- --------------- Chevrolet - Parma Transmission Plant 00001 to 14999

Chevrolet - Toledo Transmission Plant 15000 to 24999

Chevrolet - Muncie Transmission Plant 25000 to 44999

EXAMPLE: Number CT300175 designates Chevrolet transmission, year and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will reuse the above numbers using a letter prefix, such as A, B and C.

EXAMPLE: CT3A00175

Hydra-Matic Division 00001 to 99999

Hydra-Matic Division Transmissions will be numbered with the letter "H" regardless of the GM division using the transmission.

Buick Motor Division 00001 to 99999

Buick Motor Division produced transmissions will be numbered with the letter "B" regardless of the GM Division using the transmission.

1983 PASSENGER CAR TRANSMISSION PROGRAM SUMMARY

PROCESSING NUMBER

MANUAL 4-SPEED

MK2 2.88:1 First Gear Ratio - Automatic Overdrive Doug Nash M17 3.31:1 First Gear Ratio, Transverse Muncie M260 3.50:1 First Gear Ratio Muncie M19 3.53:1 First Gear Ratio, Transverse Muncie MY8 3.53:1 First Gear Ratio, Transverse Muncie MY1 3.75:1 First Gear Ratio Mumcie

MANUAL 5-SPEED

MK4 3.50:1 First Gear Ratio Borg Warner MK6 2.95:1 First Gear Ratio Borg Warner MK5 3.50:1 First Gear Ratio Borg Warner MB4 3.76:1 First Gear Ratio Borg Warner M75 3.79:1 First Gear Ratio Isuzu MY7 3.92:1 First Gear Ratio, Transverse Isuzu

AUTOMATIC 3-SPEED MD9 125c, Converter Clutch, Transverse Hydra-matic MD2 180c, Converter Clutch Strausbourg MV9 200c, Converter Clutch Hydra-matic M31 250c, Converter Clutch Parma MV4 350c, Converter Clutch Parma MX2 350c, Converter Clutch Buick

AUTOMATIC 4-SPEED

MW9 200-4R, Converter Clutch and Overdrive Hydra-matic ME9 440-T4, Converter Clutch and Overdrive, Transverse MD8 700-R4, Converter Clutch and Overdrive

TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION

Muncie Manual Transmission Production Code Explanation

The production code number contains the source code, model year and build date.

EXAMPLE:

N 3 D 10 - - - -- SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE

S = 3=Speed 1983 A - Jan. 10th (Saginaw Type) B - Feb. C - March N = 4-Speed D - April (117mm) E - May H - June K - July M - Aug. P - Sept. R - Oct. S - Nov. T - Dec.

3-Speed-(Saginaw Type)

The code is stamped on the left side of the case just below the side cover.

Muncie Truck 4-Speed

Stamped on the rear face of the transmission case just below the rear retainer.

New Process 205, 207 and 208 Model 4-Wheel Drive Transfer Case

The build date showing the month, day and year along with the Chevrolet part number is on a metal tag attached to the front face of the transfer case at PTO cover.

Truck Four-Speed Isuzu Transmission (77.5mm)

Right side of bell housing at 3:00 o'clock position five digit ink stamp transmission serial number. Below serial number is five digit ink date stamp.

2 04 01 - -- -- Last Digit of Year Month Date

350C & 700-R4 Turbo Hydra-Matic Transmissions

Refer to the passenger section of this bulletin for production code explanations.

TRUCK TRANSMISSION IDENTIFICATION NUMBER FOR "SERVICE" USAGE

The following system will be used to identify service transmission assemblies domestically produced. This number system applies to complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet).

The second letter will indicate the type of unit - "T" (Transmission). The number following the letter will designate the model year - "3" (1983). The last five digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

PLANT SERIAL SEQUENCE ----- ---------------- Chevrolet - Parma Transmission Plant 00001 to 14999 Chevrolet - Toledo Transmission Plant 15000 to 24999 Chevrolet - Muncie Transmission Plant 25000 to 99999 Hydra-Matic 400 00001 to 99999

Hydra-Matic transmissions will be numbered with the letter "H" regardless of the GM Division using the transmission.

EXAMPLE: Number CT300175 designates Chevrolet transmission, year and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will re-use the above numbers using a letter prefix, such as A, B or C to indicate late production transmission; for example: CT2A0001.

1983 TRUCK TRANSMISSION PROGRAM SUMMARY

PROCESSING NUMBER MANUAL 3-SPEED

M62 2.85 =1 First Gear Ratio Muncie M64 3.11 =1 First Gear Ratio Muncie

MANUAL 4-SPEED

MY6 3.09:1 First Gear Ratio, Overdrive New Process M20 6.55:1 First Gear Ratio Muncie M73 4.01:1 First Gear Ratio Isuzu M77 4,07:1 First Gear Ratio Borg Warner

MANUAL 5-SPEED

MB6 4.03:1 First Gear Ratio, Overdrive Borg Warner

AUTOMATIC 3-SPEED

MV9 200 Converter Clutch Hydra-matic MV4 350C,Converter Clutch Parma M40 400 Hydra-matic M40 475 Hydra-matic

AUTOMATIC 4-SPEED

MD8 700-R4, Converter Clutch, Overdrive Toledo

PASSENGER CAR REAR AXLE IDENTIFICATION

Axles are manufactured by Chevrolet Buffalo, Chevrolet Gear and Axle, Oldsmobile, Pontiac and GM of Canada (McKinnon). Divisional Manufacturer code letters will be metal stamped on the axle tube adjacent to the carrier for field identification (see example). Letters and numerals 1/4" high are metal stamped on right front inboard side, 3" outboard of carrier or are located on a metal tag attached to cover bolt.

FIELD IDENTIFICATION

4JF C 218 1 --- - --- -

AXLE CODE MANUFACTURER DAY OF 1 - FOR DAY SHIFT IDENTIFY YEAR BUILT 2 - FOR NIGHT SHIFT

MANUFACTURER IDENTITY

0 -OLDSMOBILE P -PONTIAC G -CHEVROLET GEAR AND AXLE C -CHEVROLET BUFFALO K -GM OF CANADA, ST. CATHERINES (MCKINNON)

1983 AXLE IDENTIFICATION CODES "B" SERIES (*INDICATES POSITRACTION)

2.41 RATIO 2.56 RATIO 2.73 RATIO ---------- ---------- ---------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- 8GF 7.50 8GA 7.50 8FC 7.50 8FA 7.50 8YD 8.75 8GB 7.50 *8WY 8.75 8YM 8.75 8ZE 8.75 *2TT 8.75 *8YU 8.75 8YE 8.75 *8YR 8.75 8YN 8.75 *2TU 8.75 *8WW 8.75 *8ZW 8.75 *8YW 8.75 *8YS 8.75 *2TW 8.75

2.93 RATIO 3.08 RATIO 3.23 RATIO ---------- ---------- ---------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- 8GG 7.50 8ZJ 8.75 8YK 8.75 8YF 8.75 8YJ 8.75 2TK 8.75 *2TX 8.75 2TJ 8.75 *8YZ 8.75 *8YX 8.75 *8YY 8.75 *2TZ 8.75 *2TY 8.75 *8ZZ 8.75 *8ZY 8.75 8ZK 8.75

1983 AXLE IDENTIFICATION CODES "G" SERIES (*INDICATES POSITRACTION)

2.29 RATIO 2.41 RATIO 2.56 RATIO ---------- ---------- ---------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ----

2AH 7.50 2AJ 7.50 2AA 7.50 *2BH 7.50 *2BJ 7.50 *2BA 7.50 2AT 7.50 2AZ 7.50 *2BT 7.50 *2BZ 7.50

2.73 RATIO 3.08 RATIO 3.23 RATIO ---------- ----------- ---------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- 2AB 7.50 2AC 7.50 2AU 7.50 2AL 7.50 *2BC 7.50 *2BU 7.50 *2BL 7.50 2AV 7.50 *2BB 7.50 *2BV 7.50 2AX 7.50 *2BX 7.50

1983 AXLE IDENTIFICATION CODES "F" SERIES (*INDICATES POSITRACTION)

2.73 RATIO 2.93 RATIO 3.08 RATIO ---------- ---------- ----------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- *4PW 7.50 4JF 7.50 4JG 7.50 *4JX 7.50 *4JY 7.50 *4PX 7.50 *4PY 7.50 4PG 7.50

3.23 RATIO 3.42 RATIO 3.73 RATIO ---------- ---------- ---------- RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- 4JH 7.50 4JJ 7.50 4JK 7.50 *4JZ 7.50 *4JR 7.50 *4JQ 7.50 *4PZ 7.50

1983 AXLE IDENTIFICATION CODES "T" SERIES (*INDICATES POSITRACTION)

3.36 RATIO 3.62 RATIO ---------- ----------- RING RING CODE GEAR CODE GEAR ---- ---- ---- ---- CQM 6.50 CQN 6.50

LIGHT DUTY TRUCK REAR AXLE IDENTIFICATION

Chevrolet Light Duty Trucks use either Chevrolet, Dana or Rockwell produced rear axle assemblies. See examples of production codes below.

CHEVROLET AXLE

EXAMPLE:

TUF G 001 1 --- - --- - Axle Code Source Code Day Code Shift Code

C = Buffalo Jan. 1=001 1st Shift G = Gear & Axle K = GM of Canada

Code is stamped on top of right axle tube outboard of carrier.

DANA AXLE

EXAMPLE:

603560-1 9 29 3 B 4 -------- - -- - - - DANA: MONTH DAY MODEL SHIFT PRODUCTION P/N CODE CODE YEAR CODE LINE CODE

Code is stamped on rear surface of right axle tube.

The Chevrolet produced axles use a prefix code stamped into the axle tube for axle code identification. Dana produced axles use the same prefix code as the Chevrolet axles, but they display these codes on a strip of tape attached to the outboard end of the axle tube.

1983 "C" 10-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------- ---------- C100 KYA KYC 2.56 11 x 2 8.5 3750 Detroit G & A TUM TUN 2.73 KXS KXU 3.08 KZA KHA 3.42 KBA CNA 3.73

KYB KYD 2.56 11.15 x 2.75 TAB TAD 2.73 KXT KXW 3.08 KZB KZC 3.42 KKJ CNB 3.73

C100 TUF TUJ 2.73 11 x 2 V8 + TWA TWC 3.08 M20 CSF CSJ 3.73

TUH TUK 2.73 11.15 x 2.75 TWB TWD 3.08 CSH CSK 3.73

C20903 CYA --- 3.23 11.15 x 2.75 9.5 5700 CYB CYM 3.42 CYC CYN 3.73 CZM CTA 4.10

C20903 CYD --- 3.23# 13 x 2.50 6000 20906 CYF CYR 3.42 (Exc CYH CYS 3.73 LE8) CYJ CYT 4.10 CYK CYU 4.56

(W/LE8) TKB --- 3.21 10.5 RJZ TJA 3.73 RHA RHB 4.10

C20943 TKU --- 3.21 7500 RJA RJB 3.73 KJB KJC 4.10 KFA KFB 4.56

C30903 RMR --- 3.21 13 x 3.50 30943 KKA KKD 3.73 31003 KUD KUF 4.10 31403 KSF KSH 4.56

C31003 RMB --- 3.21* 31403 KKC KKF 3.73 30943 KMC KMD 4.10 KSN KSR 4.56

C30903 TKA --- 3.73 Dana 30943 THH --- 4.10 TJH --- 4.56

# 3.23 Ratio Not Available On C20906 * 3.21 Ratio Not Available On C30943

1983 "K" 10-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE GEAR AXLE MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------ ---------- K100 TUR TUZ 2.73 11.15 x 2.75 8.5 3750# Detroit G & A KXX KXY 3.08 EX 06 KHB KHC 3.42 4000# KBD KBF 3.73

K100 KCX KCY 2.73 V8 + KCF KCH 3.08 M20 KZT KZU 3.42 TKC TKD 3.73

K20903 CYW --- 3.23 9.5 5700 CYX CZD 3.42 CYY CZF 3.73

CYZ 3.23 13 x 2.50 6000 CZA CZH 3.42

K20903 CZB CZI 3.73 20906 CZC CZK 4.10

K30903 KWW KKU 3.73 13 x 3.50 10.5 7500 30943 KUN KUR 4.10 31003 KSZ KWB 4.56

K30943 KKX KKY 3.73 31003 KMT KNU 4.10 314003 KRC KRD 4.56

K30903 TKA --- 3.73 Dana 30943 THH --- 4.10 TJH 4.56

1983 "G" 10-30 REAR AXLE IDENTIFICATION

STD.AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ----------- ---- ------ --------- G100 CAB CAN 2.73 11 x 2 8.5 3500# Detroit G & A CAC CAR 3.08 CAD CAS 3.42 CST CSW 3.73

G100 CAH CAU 2.73 11.15 x 2.75 G200 CAJ CAW 3.08 CAK CAX 3.42 CAY CSR 3.73

G31305-6 CZR CZW 3.73 13 x 2.50 9.5 5700 31303-32 CZS CZX 4.10

G31303-6 C2N CZU 3.23 31332

G31303 CZT CZY 4.56 31332 MCA 4.10 13 x 3.50 9.75 6200 Dana MDA --- 4.56

G31603 MCB --- 4.10 31632 MDB 4.56

G31303 MCC --- 4.10 10.5 7500 31603 MDC --- 4.56 31632

1983 "P" 20-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------ ---------

P20842 CYC CYN 3.73 11.15 x 2.75 9.5 5700 Detroit G & A 21042 CZM --- 4.10

CYH CYS 3.73 13 x 2.50 6000 CYJ --- 4.10

P30842 KMH --- 4.10 10.5 7900 31042 KST KSU 4.56 31442

KUB --- 4.10 13 x 3.50 KRU KRW 4.56

P30842 KMN 4.10 31042 SKY KWA 4.56 31442 KTA --- 5.13* 31842 30832 31132 31432 31832

P30842 TSA 5.29 13.75 x 1.53 12.0 11000 Rockwell 31042 TTA --- 5.83 Disc 31442

P31432 MAC 4.56 10.5 10000 Dana 31832 MEA --- 4.88 CNR --- 5.86

*5.13 Ratio Axle Not Available On Motor Home Chassis 032 Models.

1983 S-T 10 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------ --------- S100 CSK CSN 2.73 9.5 x 2 7.5 2600 Buffalo G & A CXA CXB 3.08 CFB CFC 3.42 CSM CWN 3.73 CDC CDD 4.11 CFA* 2.73

T100 CWA CWB 2.73 2700 CXC CXD 3.08 CFD CWC 3.42 CWD CWF 3.73 CDF CDH 4.11

*Aluminum Drums, With RPO Z07 Only.

LIGHT DUTY TRUCK FOUR WHEEL DRIVE FRONT AXLE IDENTIFICATION

Chevrolet Light Duty Trucks use either Chevrolet or Dana produced front axle assemblies. Production code explanations are similar to those covered under rear axle identification.

CHEVROLET AXLES

Code is stamped on top rear section of left axle tube. (In- cludes axle ratio code).

DANA AXLES

Code is stamped on forward side of left axle tube. Axle ratio code on tape strip around right axle tube.

1983 "K" 10-30 FRONT AXLE IDENTIFICATION

AXLE BRAKE GEAR AXLE MODEL AXLE CODE RATIO SYSTEM DIA. RATING AXLE MFR. ----- ---------- ----- ------ ---- ------ ----------

K100 WK 2.56 JB/D5 8.5 3600 Detroit G & A WA 2.73 WB 3.08 WF 3.42 WM 3.73

K200 WC 3.23 JB/D6 3800 WH 3.42 TBH 3.73

K200 HD TFA 3.23 JB/D7 THA 3.42 TBC 3.73 TCC 4.10

K300 TBA 3.73 JB/D8 9.75 4500 Dana Single TCA 4.10 Wheel TDA 4.56

K300 TBB 3.73 Dual TCB 4.10 Wheel TDB 4.56

1983 "T" 10 FRONT AXLE IDENTIFICATION

MODEL AXLE CODE AXLE RATIO GEAR DIA. AXLE MFG. ----- --------- ---------- --------- --------- T10 TJA 2.73 7.25 Detroit G & A TM 3.08 TMB 3.42 TBD 3.73 MFA 4.11

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.