Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1991JIMMY 5.7 K, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - OVERHAUL - 4L80-ECOMPONENT DISASSEMBLY & REASSEMBLYOVERDRIVE ASSEMBLYDISASSEMBLY
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8
Overdrive Assembly: Disassembly
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8SECTION Disassembly
- Remove overrun clutch housing from overdrive assembly. See Figure. Disassemble overrun clutch. See Figure and Figure . Using Clutch Spring Compressor (J-23327) and Adapter (J-38734), compress spring retainer, and remove clutch piston. See Figure.
- Disassemble overdrive assembly. See Figure. If necessary, disassemble overdrive carrier assembly. See Figure.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.