GM 15067323 Transmission Assembly, Man (Nv3500)

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To remove the transmission, start by disconnecting the negative cable from the battery and raising the vehicle on jackstands. Drain the transmission fluid and reinstall the pan, then unplug all electrical connectors. On 1994 models, disconnect the shift linkage, while on 1995 and later models, disconnect the shift cable. Remove the driveshaft and, if applicable, the front driveshaft for 4WD vehicles. If the vehicle has 4WD, remove the transfer case. Relieve the fuel system pressure and disconnect the fuel line fittings. Remove the rear transmission mount-to-crossmember nut(s) and the cross member-to-frame bolts. Take out any exhaust components that may interfere with transmission removal and remove the starter motor. Remove the torque converter cover and mark the torque converter and driveplate for proper reinstallation. Remove the drive plate-to-torque converter bolts by turning the crankshaft. Support the engine and transmission with jacks, then remove the crossmember. Detach the fuel line and wiring harness brackets from the transmission. Remove the transmission-to-engine bolts and the transmission dipstick tube. Lower the transmission slightly and disconnect and plug the transmission fluid cooler lines. Remove the transfer case shifter and move the transmission to the rear to disengage it from the engine block dowel pins. Secure the torque converter to the transmission. To install the transmission, ensure the torque converter hub is securely engaged in the pump. Raise the transmission into position, keeping it level to prevent the torque converter from sliding out. Connect the transmission fluid cooler lines and align the marks on the torque converter and driveplate. Carefully move the transmission forward until the dowel pins engage with the holes in the bell housing. Install the transmission housing-to-engine bolts and tighten them securely. Install the drive plate-to-torque converter bolts and tighten them to the specified torque. Install the crossmember and remove the jacks supporting the transmission and engine. Install the dipstick tube, starter motor, and reconnect the shift linkage or cable. Plug in the transmission wire harness connectors and install the torque converter cover. If applicable, install the transfer case and driveshaft(s). Install any exhaust system components that were removed and lower the vehicle. Finally, fill the transmission with the specified fluid, run the engine, and check for fluid leaks.

Connect the negative battery cable, road-test the vehicle, and check for leaks to ensure a successful transmission installation.

On 1994 models, disconnect the shift linkage. On 1995 and later models, disconnect the shift cable.

Connect the negative battery cable, road-test the vehicle, and check for leaks to ensure a successful transmission installation.

To install the transmission, first, install the clutch components if necessary. Then, raise the transmission into position and slide it forward to engage the input shaft with the clutch plate hub.

Secure the torque converter to the transmission.

On 1994 models, disconnect the shift linkage. On 1995 and later models, disconnect the shift cable.

You should support the engine/transmission assembly with a jack. Then, remove the transmission mount bolts, catalytic converter hanger, and support braces.