Chevrolet Sonic Repair Manual: Automatic Transmission Flex Plate Replacement

Preliminary Procedure

Remove the transmission. Refer to Transmission Replacement.

• EN-470-B Angular Torque Wrench
• EN-49979 Crankshaft Shock Mount Retainer

For equivalent regional tools, refer to Special Tools.

1

Automatic Transmission Flex Plate Fastener (Qty: 6)

Procedure

Ensure to use a NEW fastener whenever the automatic transmission flex plate is removed.

• 35 Y (26 lb ft)
• Tighten the bolt an additional 30 degrees, and one more pass at 15 degrees using EN-470-B wrench .

2

Flex Plate

3

Automatic Transmission Flex Plate

Procedure

Inspect the automatic transmission flex plate for the following:

1. Stress cracks around the flex plate.
2. Cracks at welded areas that retain the ring gear onto the flex plate.
3. Damaged or missing ring gear teeth.
4. Do not attempt to repair the welded areas that retain the ring gear to the automatic transmission flex plate. Install a new flex plate.