GM Service Manual Online
For 1990-2009 cars only

Loss of Drive

Checks

Causes

Torque Converter (55)

    • Broken lugs or a failed lug weld
    • Sheared lug bolts
    • Worn turbine shaft splines
    • An internal failure
    • A cracked cover at the weld

Wheel Drive Shafts

    • Damaged
    • Worn or loose splines

Turbine Shaft (39)

Stripped splines

Oil Pump (10)

Seized or broken pump gears

Oil Pump Shaft (19)

Broken or stripped splines

Filter and Filter Seal (84, 85)

Plugged or missing

Fluid Level

Low

Shift Linkage

Disconnected

Drive/Driven Sprockets and Drive Chain (36, 37, 91)

Broken

Planetary Gears

Failure or lack of lube

Final drive

Gear failure or lack of lube

Channel Plate and Gasket (28)

Damaged, leaking, or misaligned

Valve Body, Gaskets, and Spacer Plate

Damaged, leaking, or misaligned

    • Forward Sprag Clutch
    • Forward Clutch
    • Low Roller Clutch

Damaged or not holding

Refer to No First Gear, Slips in First Gear .

Hydraulic System

    • Tie up
    • Fluid circuit leaks