GM Service Manual Online
For 1990-2009 cars only

Transmission Seized

Checks

Cause

(Rear Lube Components)

Cooler Circuit

Blocked or leaking

Spacer Plate/Gasket

A hole is missing

Lube Pipe (39)

    • Poor seal
    • Damaged
    • Missing clips

Valve Body (301)

Loose, broken, or missing bolts

Inline Filter

Blocked

Output Shaft Seal (20)

    • Missing or damaged
    • Lube holes are missing or the holes are blocked.

Main Shaft (662)

Lube holes are missing or the holes are blocked

Center Support (640)

    • Lube holes are missing or the holes are blocked
    • Not held

Apply Pin (55)

    • Too long
    • Binding in the case

Piston (58)

Binding in the case

Snap Ring (642)

Not seated.

Sun Gear Shaft (649)

    • Bearing surface is worn
    • Blocked lube hole

Rear Gear set

The bearing surface is worn

Main Shaft (662)

The lube holes are plugged

(In 2nd, 3rd, and 4th)

Rear Band (657)

Locked On

Rear Servo Pin (73)

Too long or binding in the case

Piston (65)

Binding in the case