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.
Inoperative Or Slips In 1ST Gear
If vehicle is inoperative or transaxle slips in 1st gear, check for a leaking forward clutch piston seal. A new Viton Forward Clutch Piston Seal (8631986) is available to correct this condition. Viton seal went into production October 6, 1989 (Julian Date 279), for all Hydra-Matic 3T40 transaxles built by Willow Run. Viton seal may be used on all Hydra-Matic 3T40 transaxles.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.