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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (AUTOMATIC TRANSAXLE OVERHAUL & TESTING - 4T65-E)COMPONENT DISASSEMBLY & REASSEMBLYDRIVEN SPROCKET SUPPORT ASSEMBLYINSPECTION
1999 GMC Forward Control 5.7 R, Automatic
Driven Sprocket Support Assembly: Inspection
1999 GMC Forward Control 5.7 R, AutomaticSECTION Inspection
WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2003 Pontiac Montana, 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Pontiac Aztek, and 2003 Oldsmobile Silhouette. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect driven sprocket support components for the following:
- Worn or cut oil seal rings.
- Rolled or cut second clutch housing oil seal ring seals.
- Damage to piston seal surface in driven sprocket support.
- Blocked or porous oil passages in driven sprocket support.
- A leaking or missing cup plug.
- Damaged 4th clutch piston.
- Cracked or distorted 2nd clutch housing thrust washer.
- Distorted or missing springs in 4th clutch spring assembly.
- Driven sprocket bearing assembly for foreign material and missing, flat or damaged rollers.
- Replace Teflon oil seal rings if cut or damaged, or if complete overhaul is being performed. Check all seal ring grooves for debris, burrs or damage. See Figure.
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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.