For 1990-2009 cars

1. Remove any sealant and automatic transmission fluid from the contacting surfaces of the transmission case cover and the transmission case.

Note: Do not get any fluid on the contacting surfaces of the transmission case cover or the transmission case.

2. Apply a 3 mm (1/8 in) bead of sealant GM P/N 89020326 (Canadian P/N 89021188), to the transmission case cover.
3. Install the transmission case cover assembly (19) onto the transmission case assembly (17).
4. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489), to the threads of all the case cover bolts.
5. Install 7 - M8 x 1.25 x 30 mm bolts (20) and hand tighten.
6. Install 1 - M8 x 1.25 x 45 mm bolt (22) and hand tighten.
7. Install 2 - M8 x 1.25 x 48 mm bolts (21) and hand tighten.
8. Install 1 - M8 x 1.25 x 30 mm/M6 x 1.0 x 10 mm double stud (74) and hand tighten.

Note: The length of transmission case cover bolt (77) maybe 78 mm 1st design or 30 mm 2nd design. Do not use the 78 mm bolt in a 2nd design cover.

9. Install 1 - M8 x 1.25 x 78 mm if 1st design or a M8 x 1.25 x 30 mm if 2nd design bolt (77) and hand tighten.

Caution: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

10. Tighten the 12 transmission case cover assembly bolts in sequence. Tighten the 12 transmission case cover assembly bolts to 25 N·m (18 lb ft) .