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.
1993 Cadillac Eldorado V8-300 4.9LFACTORY OEM SERVICE PROCEDURE
A/T - Revised Input Speed Sensor
File In Section: 7 - Transmission
Bulletin No.: 47-71-39
Date: November, 1994
Subject:
New Input Speed Sensor
Models:
1993 Cadillac Allante, Eldorado, Seville
Transaxle Applications:
Hydra-Matic 4T80-E (RPO MH1)
Starting November 23, 1992 (Julian Date 243) all Hydra-Matic 4T80-E transaxles (Figure 1) were built with a new style input speed sensor and wiring harness.
When replacing the input speed sensor on a Hydra-Matic 4T80-E transaxle built before November 23, 1992 you must order both input speed sensor (8685532) and wire harness assembly (12143262).
Units built after this date can be serviced with the new input sensor only.
Parts Information:
Parts are currently available from GMSPO
Parts Identification: (Figures 2 and 3)
Bulletin No.: 47-71-39
Date: November, 1994
Subject:
New Input Speed Sensor
Models:
1993 Cadillac Allante, Eldorado, Seville
Transaxle Applications:
Hydra-Matic 4T80-E (RPO MH1)
Starting November 23, 1992 (Julian Date 243) all Hydra-Matic 4T80-E transaxles (Figure 1) were built with a new style input speed sensor and wiring harness.
When replacing the input speed sensor on a Hydra-Matic 4T80-E transaxle built before November 23, 1992 you must order both input speed sensor (8685532) and wire harness assembly (12143262).
Units built after this date can be serviced with the new input sensor only.
Parts Information:
Parts are currently available from GMSPO
Parts Identification: (Figures 2 and 3)
Factory Service Tools
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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.
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