GMC 8663965 Transmission Assembly, Auto (Remanufacture)(Code 9Mlm)

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After removing the transmission pan and draining the fluid, you should remove the torque converter cover and mark the torque converter and driveplate for proper reassembly.

Overhauling a manual transmission involves the disassembly and reassembly of many small parts. Precise measurements of clearances must be taken and select fit spacers and snap-rings may need to be changed.

Support the engine and transmission separately, with the latter supported by a special jack. Remove the nuts from the crossmember bolts, raise the transmission slightly, and remove the crossmember. On heavy-duty (cast iron case) transmission models, remove the transmission-to-clutch housing bolts; on normal-duty models, remove the transmission-to-engine bolts. Ensure all wires are disconnected, and then move the transmission and jack toward the rear of the vehicle until the transmission input shaft is clear of the clutch or clutch housing. Lower the transmission, taking care not to depress the clutch pedal while it's out.

To ensure proper alignment of the torque converter during installation, turn the torque converter to align the marks on the converter and driveplate.

Yes, it is possible for an inexperienced mechanic to rebuild a transmission if they have the necessary special tools and follow a step-by-step approach.

Reinstall the shift lever, reconnect the negative battery cable, road test the vehicle, and check for leaks to ensure everything is functioning correctly.