GM Service Manual Online
For 1990-2009 cars only

The production/process codes provide the description of the Regular Production Options (RPOs) used on the P-Chassis. The RPO list is printed on the Service Parts Identification Label. The following is a list of RPO abbreviations and their description:

P-Chassis RPO Table

RPO

Description

B3D

Equipment: School Bus

B3M

Equipment: School Bus, Deluxe

CD4

Wiper System: Windshield, Pulse

C6E

GVW Rating: 9,400

C6P

GVW Rating: 8,600

C6U

GVW Rating: 9,000

C7A

GVW Rating: 10,000

C7E

GVW Rating: 11,000

C7L

GVW Rating: 12,000

C7M

GVW Rating: 14,100

C7N

GVW Rating: 12,300

C7P

GVW Rating: 16,000

C7R

GVW Rating: 16,500

C7S

GVW Rating: 14,500

DET

Plant Code: Detroit, MI

ENV

HVAC Provisions: Engine Dress, Compressor and Condenser

EN2

HVAC Provisions: Delete

FE9

Certification, Emissions, Federal

FK4

Suspension System: I-Beam Construction (4,400 lb capacity)

FK5

Suspension System: I-Beam Construction (5,000 lb capacity)

FL5

Suspension System: Independent (3,650 lb capacity)

FL6

Suspension System: Independent (4,400 lb capacity)

FL7

Suspension System: Independent (5,000  lb capacity)

FL9

Suspension System: Independent (5,500 lb capacity)

FM2

Suspension System: Independent-Standard Height (3,650 lb capacity)

FM5

Axle, Front (4,400 lb capacity)

FNT

Fenders: Deletion

FN3

Axle, Front (4,000 lb capacity)

FN5

Axle, Front (4,500 lb capacity)

FN6

Axle, Front (5,000 lb capacity)

FN8

Axle, Front (5,500 lb capacity)

GL1

Axle, Rear (7,900 lb capacity)

GL2

Axle, Rear (10,000 lb capacity)

GL4

Axle, Rear (11,000 lb capacity)

GN4

Suspension, Rear (5,300 lb capacity)

GN5

Suspension, Rear (6,200 lb capacity)

GN6

Suspension, Rear (7,500 lb capacity)

GN7

Suspension, Rear (8,000 lb capacity)

GP4

Suspension, Rear (11,000 lb capacity)

GP5

Suspension, Rear (11,800 lb capacity)

HPR

Headlamps: Dual, Rectangular

JB7

Brakes: Hydraulic, Power Disc/Drum (8,400 lb GVW)

JB8

Brakes: Hydraulic, Power Disc/Drum (10,000 lb GVW)

JF9

Brakes: Hydraulic, Power four Wheel Disc

J71

Brake, Parking, Power Operated

KC4

Cooling System: Engine Oil

KG4

Generator: 145 Amp

KW2

Generator: 124 Amp

K05

Heater: Engine Coolant

K34

Cruise Control: Electronic

K68

Generator: 105 Amp

L19

Engine: 7.4 Liter V8, TBI

L29

Engine: 7.4 Liter V8, SFI

L31

Engine: 5.7 Liter V8, SFI

L35

Engine: 4.3 Liter V6, SFI

L57

Engine: 6.5 Liter V8, Diesel HO

L65

Engine: 6.5 Liter V8, Turbo Diesel HO

MT1

Transmission: Hydra-Matic 4L80-E, four-Speed Automatic

MW3

Transmission: New Venture Gear 4500, Manual five-Speed

NA5

Emission System: Federal Requirements, Tier 0

NA6

Emission System: High Altitude Requirements

NA9

Evaporative System: Emission

NB2

Emission System: California Requirements, Tier 0

NB6

Emission System: California Requirements, Tier 1

NJ9

Fuel Tank: 80 gal. LH or RH Fill

NN4

Fuel Tank: 60 gal.

Q34

Wheel: Spare, 19.5 x 6

RHQ

Harness Assembly: Tail and Stop Lamp

R04

Wheel: Single, Rear

R05

Wheel: Dual, Conversion Rear

R4N

Tire Front: Bridgestone

S4N

Tire Front: Bridgestone

UA1

Battery: Heavy-Duty

UJ1

Indicator System: Brake Warning

U18

Speedometer: Instrument, Kilometer

VH6

Bumper: Front, Black

VKL

Bumper: Front, Extra Wide, White

VP6

Noise Control

V01

Radiator: Heavy-Duty

V14

Cooler, Oil, Transmission, Auxiliary

XHF

Tire: Front, LT225/75R16/E BL R/PE ST ALS

XTN

Tire: Front, LT225/70R19.5/F BW R/ST ST TL HWY

XTV

Tire: Front, 8.00R019.5 E RADIAL R/B SBR HWY TBLS B/W (Goodyear)

XWG

Tire: Front, 7.50R16/D BW R/ST ST TL HWY

XYK

Tire: Front, LT215/85R16D BL R/PE ST TL HWY

XYN

Tire: Front, LT235/85R16/E BL R/PE ST TL HWY

X88

Conversion: Name Plate, Chevrolet

YF5

Certification, Emissions, California

YHF

Tire: Front, LT225/75R16/E BL R/PE ST ALS

YTN

Tire: Rear, 225/70R19.5F BW R/ST ST TL HWY

YTV

Tire: Rear, 8.00R19.5 E RADIAL R/B SBR HWY TBLS B/W (Goodyear)

YWG

Tire: Rear, 7.50R16/D BL R/ST ST TL HWY

YYK

Tire: Rear, LT215/85R16/D BL R/PE ST TL HWY

YYL

Tire: Rear, LT215/85R16/D BL R/PE ST TL OOR

YYN

Tire: Rear, LT235/85R16/E BL R/PE ST TL HWY

ZHF

Tire: Spare, LT225/75R16/E BL R/PE ST ALS

ZTN

Tire: Spare, 225/70R19.5/F BW R/ST ST TL HWY

ZTV

Tire: Spare, 8.00R19.5 E RADIAL R/B SBR HWY TBLS B/W (Goodyear)

ZWG

Tire: Spare, 7.50R16/D BW R/ST ST TL HWY

ZYK

Tire: Spare, LT215/85R16/D BL R/PE ST TL HWY

ZYL

Tire: Spare, LT215/85R16/D BL R/PE ST TL OOR

ZYN

Tire: Spare, LT235/85R16/E BL R/PE ST TL HWY

Z88

Conversion, Name Plate "GMC Truck"

005

Ratio Code 4.56

006

Ratio Code 4.63

058

Ratio Code 6.26

066

Ratio Code 4.10

1SA

Package Option 01

1SB

Package Option 02

1SC

Package Option 03

1SD

Package Option 04

1SE

Package Option 05

1SF

Package Option 06

1SZ

Package Option 07

17P

Wheel Color: Silver

3EC

Tire: Rear, LT215/85R16/E BL R/ST TL HWY

3ED

Tire: Rear, LT215/85R16/E BL R/ST TL ALS

4EC

Tire: Rear, LT215/85R16/E BL R/ST TL HWY

4ED

Tire: Rear, LT215/85R16/E BL R/ST TL ALS

40P

Wheel Color: White

41P

Wheel Color: Black

84P

Wheel Color: Gray