Slips in First Gear
WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Slips in 1st Gear
| Checks |
Causes |
| Forward Clutch Assembly (646-651) |
- Clutch plates worn
- Porosity or damage in forward clutch piston
- Forward clutch piston inner and outer seals missing, cut or damaged
- Damaged forward clutch housing
- Forward clutch housing retainer and ball assembly not sealing or damaged
|
| Forward Clutch Accumulator (353-358) |
- Piston seal missing, cut or damaged
- Piston out of its bore
- Porosity in the piston or valve body
- Stuck abuse valve
|
| Input Housing and Shaft Assembly (621) |
Turbine shaft seals missing, cut or damaged |
| Valve Body (60) |
- 1-2 Accumulator valve stuck
- Face not flat, damaged lands or interconnected passages
- Spacer plate or gaskets incorrect, mispositioned or damaged
|
| Low Roller Clutch (678) |
- Damage to lugs to inner ramps
- Rollers not free moving
- Inadequate spring tension
- Damage to inner splines
- Lube passage plugged
|
| Torque Converter (1) |
Stator roller clutch not holding |
| 1-2 Accumulator Assembly (55-57, 104) |
- Porosity in piston or 1-2 Accumulator cover and pin assembly
- Damaged ring grooves on piston
- Piston seal missing, cut or damaged
- Valve body to spacer plate gasket at 1-2 Accumulator cover, missing or damaged
- Leak between piston and pin
- Broken 1-2 Accumulator spring
|
| Line Pressure |
Refer to Oil Pressure High or Low . |
| 2-4 Servo Assembly (13-28) |
4th Servo piston in backward |