GMC 15691901 Transmission Assembly, Man *Trans. Kits

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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.

To support the engine and transmission with jacks, you should use appropriate jacks to lift and secure both components. This is important for safe removal and reinstallation.

To begin the removal process, start by disconnecting the negative battery cable and then proceed to remove the shift lever.

During the disassembly of the transmission, it is important to make careful notes of how each piece comes off, where it fits in relation to other pieces, and what holds it in place. This will make reassembly easier.