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Home >> GMC Truck >> 1998 >> K 3500 Truck 4WD V8-454 7.4L VIN J SFI >> Repair and Diagnosis >> Transmission and Drivetrain >> Manual Transmission/Transaxle >> Service and Repair >> NV4500 (MW3) Manual Transmission >> On-Vehicle Service >> Transmission Replacement (NV4500 RWD)

Transmission Replacement (NV4500 RWD)

REMOVAL PROCEDURE

- Tools Required
- J36221 Clutch Line Disconnect Tool

1. Shift the transmission into 3RD or 4TH speed gear.
2. Remove the transmission shift lever and the boot. Refer to Shift Lever.
3. Raise the vehicle.
4. Drain the transmission oil. Refer to Fluid Replacement (NV4500).
5. Remove the propeller shaft. Refer to one of the following procedures in Propeller Shaft.
- Propeller Shaft Replacement (Front Axle-All Except NP8)
- Propeller Shaft Replacement (Front Axle-NP8)
- Propeller Shaft Replacement (System Balanced Assembly)

6. Remove the parking brake and controls, if used. Refer to Parking Brake Replacement in Parking Brake.
7. Disconnect the wiring harness connector from the backup lamp switch and from the vehicle speed sensor.
8. Disconnect the wiring harness retainers from the transmission.





9. Disconnect the hydraulic clutch line from the concentric slave cylinder using the J36221.





10. Remove the transmission vent hose from the transmission.
11. Remove the transmission rear mount.
12. Support the transmission.
13. Remove the frame crossmember. Refer to Rear Bumper Brace Replacement in Frame and Bumpers.
14. Remove the transmission to engine bolts.
15. Pull the transmission straight back on the clutch hub splines. Do not let the transmission hang from the clutch plate and clutch cover.





16. Remove the transmission from the vehicle.

INSTALLATION PROCEDURE

IMPORTANT:
- Do not force the transmission into the clutch.
- Do not let the transmission hang from the clutch.
- Leave the safety stand under the transmission for support.





1. Install the transmission.
1.1. Put a thin coat of high-temperature grease on the main drive gear splines.
1.2. Shift the transmission into 3RD or 4TH speed gear.
1.3. Rotate the transmission clockwise onto the clutch hub splines.
1.4. Install the transmission to the engine bolts and washers.
^ Tighten the bolts to 100 Nm (74 ft. lbs.).

NOTICE: Refer to Fastener Notice in Service Precautions.

2. Install the transmission to engine bolts.
- Tighten the studs to 31 Nm (23 ft. lbs.).

3. Install the frame crossmember. Refer to Rear Bumper Brace Replacement in Frame and Bumpers.
4. Install the transmission rear mount.
5. Remove the safety stand from beneath the transmission.





6. Install the transmission vent hose.





7. Install the hydraulic clutch line to the concentric slave cylinder quick connect.
8. Install the wiring harness retainers to the transmission.
9. Connect the following electrical wiring harness connectors:
- The vehicle speed sensor
- The backup lamp switch

10. Install the propeller shaft. Refer to one of the following procedures in Propeller Shaft.
- Propeller Shaft Replacement (Front Axle-All Except NP8)
- Propeller Shaft Replacement (Front Axle-NP8)
- Propeller Shaft Replacement (System Balanced Assembly)

11. Install the parking brake and controls, if removed. Refer to Parking Brake Replacement in Parking Brake.
12. Fill the transmission with new oil. Refer to Fluid Replacement (NV3500) or Fluid Replacement (NV4500).
13. Remove the safety stands.
14. Lower the vehicle.
15. Install the shift lever and the boot. Refer to Shift Lever.

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