GM 19418484 TRANSMISSION ASM,MAN

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To remove the transmission, first turn the steering wheel to align the front wheels straight and lock it. Disconnect the battery, then raise the front of the vehicle and securely support it on jackstands, ensuring it is high enough for the transmission to be pulled out. For 2011 and earlier models, drain the cooling system, then remove the heater inlet and outlet tube bolts and tubes from the thermostat housing. Next, remove the exhaust system and the driveshaft, and disconnect and plug the transmission cooler lines if equipped. Disconnect the electrical connectors for the Vehicle Speed Sensor and backup light switch, then remove the clutch hydraulic line retaining clip, pull the line out, and plug it. Remove the shift knob and the shift control rod assembly, then support the transmission with an approved transmission jack. For Tremec transmissions, support the engine from above and loosen the subframe fasteners to lower the subframe slightly for access to the transmission top mounting bolts. Lower the rear of the transmission to remove the engine-to-transmission mounting bolts and disconnect any wiring harness retaining clips. Move the transmission away to disengage it from the engine block dowel pins, then carefully lower it to the floor and remove it. For installation, lubricate the input shaft with high-temperature grease, secure the transmission to the jack, raise it into position behind the engine, and carefully slide it forward to engage the input shaft with the clutch. Ensure not to use excessive force; if the input shaft does not slide into place, adjust the angle or turn the input shaft for proper engagement. Once flush with the engine, install and tighten the transmission-to-engine bolts to the specified torque. Complete the installation by reversing the removal steps, ensuring to lock the control rod pin retainers, fill the transmission with the correct fluid, and fill and bleed the clutch system.

Overhauling a manual transmission involves the disassembly and reassembly of numerous small parts, requiring precise measurements of clearances. This may necessitate the use of select-fit spacers and snap-rings.

To disconnect the wiring harness, depress the locking mechanism, rotate the connector counterclockwise, and pull it off.

It is necessary to determine whether the fault is electrical, mechanical, or hydraulic in nature before any repair work can be contemplated.