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No Fourth, Fifth, and Sixth Gear

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 fatigued 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 stickiness.

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 .

   


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