No Fourth, Fifth, and Sixth Gear
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
| Checks |
Causes |
| 4 - 5 - 6 Clutch Assembly |
- Inspect for damaged, stripped or sheared splines on 4 - 5 - 6 Clutch Plates (526 - 528), Backing Plate (529)
- Inspect for broken or fatiqued 4 - 5 - 6 Clutch Waved Plate (525)
- Inspect for damaged or broken 4 - 5 - 6 Clutch Piston (520) and Piston Seals (518, 519, 521)
- Inspect for broken or fatigued 4 - 5 - 6 Piston Return Spring (522)
- Inspect for broken or disengaged 4 - 5 - 6 Backing Plate Retainer (532)
- Inspect for damaged or broken 4 - 5 - 6 Clutch Dam Piston (523) and piston seals damaged, worn or delaminating
- Inspect for broken or disengaged 4 - 5 - 6 Clutch Dam Retainer (524)
- Inspect for stripped or sheared splines on the Reaction Carrier Hub (531)
- Inspect for stripped or sheared splines on 3 - 5 Rev/4 - 5 - 6 Housing to Turbine Shaft (516)
- Inspect for loose, worn or damaged 3 - 5 Rev/4 - 5 - 6 Housing Bushing
- Inspect for broken, porous or improper surface finish or plugged oil passages of the 3 - 5 Rev/4 - 5 - 6 Housing (516)
|
| Transmission Case Assembly |
Inspect the input shaft support (56) for missing or damaged fluid ring seals (58). |
| Control Valve Body Assembly |
Inspect the reverse and 4-5-6 regulator valve (411) and ball check valve (404) for debris and stickyness. |
| Control Solenoid (w/Body and TCM) Valve Assembly |
Check the pressure control solenoid 3 (R1/456) for proper operation. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . |