GM Service Manual Online
For 1990-2009 cars only

Component

Inspect

Oil Pump Assembly

    • Pump cover retainer and ball assembly omitted or damaged
    • Faces not flat

Valve Body Assembly

    • Valves stuck
       - 2-3 Shift valve train
       - Accumulator valve
       - 1-2 Shift valve train
       - 3-2 Control valve
    • Spacer plate or gaskets are incorrect, incorrectly assembled or damaged

2-4 Servo Assembly

    • Incorrect band apply pin
    • Missing or damaged servo seals
    • Porosity in piston, cover or case
    • Damaged piston seal grooves
    • Plugged or missing orifice cup plug

Case

    • 3rd accumulator retainer and ball assembly leaking
    • Porosity in 3-4 accumulator piston or bore
    • 3-4 accumulator piston seal or seal grooves damaged
    • plugged or missing orifice cup plug
    • Restricted oil passage

Input Housing Assembly

Refer to No 2-3 Shift or Shift Slips, Rough or Hunting

2-4 Band Assembly

Worn or incorrectly assembled