GM 25973870
Transmission Mount

The first step for engine transmission mount balance requires vehicle support while it rests on blocks. The procedure begins with front transaxle mount through bolt and rear transaxle mount through bolt loosening while the vehicle reaches floor position. Two floor jacks together with wood blocks should support the powertrain assembly underneath the engine and transaxle region. The second step involves releasing the transaxle mount to transaxle bolts and engine mount to bracket bolts. Both floor jacks require shifting to form a 1/8 inch space between the mount and bracket. Tighten the transaxle mount to transaxle bolts first to 45 nm using the specified sequential order before you apply 50 nm to the engine mount to bracket bolts using the same sequence. After removing floor jacks beneath the Oil Pan shake the powertrain vigorously beginning at the front then moving to the rear and let it settle before the process ends. Follow up by tightening the rear through bolt of the transaxle mount to 100 nm (74 lb ft) while also tightening the front through bolt of the transaxle mount to 100 nm (74 lb ft) prior to lowering the vehicle.

Remove the underhood electrical center bracket and reposition the electrical center.

Allow the front and rear transaxle mounts to settle with the through bolts loosened, and loosen the rear transaxle mount through bolt.

Raise and support the vehicle.

Tighten them to 34 Nm (25 lb ft).

Tighten the rear transaxle mount to frame bolts to 60 N.m (44 lb ft).

Tighten the rear transaxle mount to frame bolts to 60 N.m (44 lb ft).

Install the transmission mount to the mid-rail, ensuring to tighten the mid-rail bolts to 27 Nm (20 lb ft).

Raise and support the vehicle.

Tighten them to 65 Nm (48 lb ft).

Allow the front and rear transaxle mounts to settle with the through bolts loosened.

Lower the vehicle afterward.

Remove the floor jacks from under the oil pan, shake the powertrain vigorously from front to rear, and allow it to settle.