Transmission System Description and Operation. GMC Truck GMC K Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC K Sierra - 4WD 🢒 Transmission/Transaxle 🢒 Manual Transmission - NV 4500 🢒 Transmission System Description and Operation

The New Venture Gear NV4500 (109 mm) is a 5 speed manual transmission used on light duty trucks. This manual transmission is identified by the RPO MW3. The 109 mm is the distance between the input shaft and the counter shaft. The transmission is available in rear wheel and four wheel drive versions. The NV4500 transmission is built in Muncie, Indiana by New Venture Gear, (a division of New Process Gear) for General Motors Powertrain.

The transmission has the following features:

•	Made from cast iron for durability

•	Synchronized shifting in all forward gears

•	Constant mesh helical gearing for reduced noise

•	Overspeed inhibitor from low to first speed gears

•	Dual cone low speed gear and 1st speed gear synchronizer

•	Multiple ring sychronizers for smooth shifting

Figure 1:

Transmission Case and Gear Sets


(1)	Countershaft Rear Bearing
(2)	Thrust Washer Pin
(3)	Transmission Countershaft
(4)	Countershaft Front Bearing
(5)	Reverse Idler Gear Shaft
(6)	Reverse Idler Gear Washer
(7)	Reverse Idler Gear Bearing
(8)	Reverse Idler Gear
(9)	Reverse Idler Gear Washer
(10)	Input Shaft Bearing Retainer Bolt
(11)	Input Shaft Retainer
(12)	Input Shaft Seal
(13)	Input Shaft Bearing Cup
(14)	Countershaft Bearing Cap
(15)	Countershaft Front Bearing Cup
(16)	PTO Cover Bolt
(17)	PTO Cover
(18)	Chip Magnet
(19)	Transmission Case
(20)	Countershaft Rear Bearing Cup
(21)	Countershaft Bearing Shim
(22)	Countershaft Thrust Washer
(23)	Countershaft Rear Bearing Retainer
(24)	Countershaft Rear Bearing Retainer Bolt
(25)	Overdrive Gear Bearing
(26)	Countershaft Overdrive Gear
(27)	Synchronizer Strut
(28)	Synchronizer Spring
(29)	Overdrive Synchronizer Sleeve
(30)	Overdrive Gear Blocking Ring
(31)	Overdrive Clutch Gear
(32)	Overdrive Synchronizer Retaining Ring
(33)	Overdrive Shift Fork
(34)	Shift Fork Lock Pin
(35)	Overdrive/Reverse Shift Shaft
(36)	Mainshaft Bearing Retainer Bolt
(37)	Mainshaft Bearing Retainer
(38)	Mainshaft Bearing Shim
(39)	Mainshaft Rear Bearing Cup

Figure 2:

Main Drive Gear and Mainshaft Gear Sets


(1)	Vehicle Speed Sensor Reluctor Wheel
(2)	Mainshaft Overdrive Gear
(3)	Mainshaft Rear Bearing
(4)	Reverse Gear Thrust Washer
(5)	Reverse Gear
(6)	Reverse Gear Synchronizer Insert
(7)	Synchronizer Spring
(8)	Reverse Gear Synchronizer Ring
(9)	Reverse Shift Detent Spring Sleeve
(10)	Reverse Gear Bearing
(11)	Reverse Gear Spacer
(12)	Reverse Gear Retaining Ring
(13)	1st/Reverse Gear Clutch Hub
(14)	1st Gear Bearing
(15)	1st Speed Gear
(16)	Mainshaft
(17)	Thrust Washer Retaining Pin
(18)	1st Gear Outer Synchronizer Ring
(19)	Middle Synchronizer Ring
(19)	Middle Synchronizer Ring
(20)	Inner Blocker Synchronizer Ring
(20)	Inner Blocker Synchronizer Ring
(21)	Retainer Ring
(21)	Retainer Ring
(21)	Retainer Ring
(22)	1st/2nd Gear Synchronizer Spring
(23)	Synchronizer Spring
(24)	1st/2nd Gear Synchronizer Insert
(25)	1st/2nd Gear Synchronizer Hub
(26)	1st/2nd Synchronizer Sleeve
(27)	2nd Gear Outer Synchronizer Ring
(28)	2nd Speed Gear
(29)	2nd Speed Gear Bearing
(30)	3rd Gear Thrust Washer
(31)	3rd Gear Retaining Ring
(32)	Mainshaft Gear Bearing Spacer
(33)	Mainshaft 3rd Speed Gear
(34)	3rd Speed Gear Bearing
(35)	3rd Gear Blocking Ring
(36)	3rd/4th Gear Synchronizer Hub
(37)	3rd/4th Gear Synchronizer Spring
(38)	3rd/4th Gear Synchronizer Insert
(39)	3rd/4th Gear Synchronizer Sleeve
(40)	3rd Gear Blocking Ring
(41)	Drive Gear Clutch Gear
(42)	Drive Gear Bearing
(43)	Main Drive Gear Bearing
(44)	Main Drive Gear
(45)	Input Shaft Bearing Cone

Figure 3:

Shift Cover


(1)	Cup Interlock Expansion Plug
(2)	Cover To Case Bolt
(3)	Cover Pin
(4)	Shift Lever Cover
(5)	Vent Pipe
(6)	Shift Fork Interlock Pin
(6)	Shift Fork Interlock Pin
(6)	Shift Fork Interlock Pin
(7)	3rd and 4th Shift Fork
(8)	Shift Fork Pad
(9)	1st and 2nd Shift Shaft
(10)	Shift Interlock Plunger
(11)	Shift Rod Interlock Pin
(12)	3rd and 4th Shift Shaft
(13)	1st and 2nd Shift Fork
(14)	1st and 2nd Shift Lug
(15)	3rd and 4th Shift Lug
(16)	Reverse and Overdrive Fork
(17)	Overdrive Lug
(18)	Overdrive and Reverse Shift Shaft
(19)	Shift Fork and Bar Poppet Plunger
(20)	Shift Rod Poppet Ball Spring
(21)	Shift Bar Housing Expansion Plug
(22)	Backup Lamp Switch
(23)	Backup Lamp Switch Gasket

Figure 4:

Transmission Extension


(1)	Mainshaft Nut
(2)	Mainshaft Nut Washer
(3)	Transmission Extension
(4)	Transmission Bolt
(5)	Transmission Case Lock Pin
(6)	Vehicle Speed Sensor
(7)	Transmission Case Lock Pin
(8)	Transmission Bolt
(9)	Transmission Extension
(10)	Rear Output Shaft Rear Bearing
(11)	Mainshaft Rear Bearing Retainer Ring
(12)	Mainshaft Seal
(13)	Propeller Shaft Yoke
(14)	Rubber Washer
(15)	Mainshaft Nut Washer
(16)	Mainshaft Nut
(17)	Speed Sensor Bolt
(18)	Speed Sensor
(19)	Transmission Case Lock Pin
(20)	Transmission Bolt
(21)	Transmission Extension
(22)	Speedometer Drive Spacer
(23)	Rear Output Shaft Rear Bearing
(24)	Mainshaft Rear Bearing Retainer Ring
(25)	Mainshaft Seal