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.
EXPERTEC TSB (92-T-24-SATURN)
Reference number: 92-T-24-SATURN
EXPERTEC TSB
TECHNICAL SERVICE BULLETIN
TRANSAXLE GRIND IN REVERSE MAY NOT ENGAGE REVERSE, 2ND
92-T-24-SATURN
04/21/1992
SUBJECT
Automatic Transaxle Grinds into Reverse/May Not Engage Reverse and 2nd Gear (Replace Dog Clutch Sleeve, Hub Assembly and/or Shift Fork)
MODELS AFFECTED
All 1991 and 1992 SL1, SL2 Sedans and SC Coupes with MP6 or MP7 automatic transaxles
CONDITION
The transaxle grinds when shifted into reverse, or may not engage reverse or 2nd gear. When reading codes from the PCM/TC, a Code 22 may be present.
CAUSE
This condition may be caused by a damaged forward & reverse dog clutch sleeve & hub. This damage may occur if the transaxle is shifted into reverse while driving forward, or by rocking the vehicle without stopping the wheels before shifting into reverse gear. There are two types of damage that may occur to the dog clutch sleeve and hub.
- Damage to the teeth on the dog clutch sleeve and the mating teeth on the reverse driven gear may cause grinding when reverse is engaged and may cause the transaxle to hop-out of reverse gear.
- The forward & reverse dog clutch sleeve is broken. This type of damage will cause a no reverse and no second gear condition and may set a PCM/ TC Code 22.
CORRECTIVE ACTION
Follow the information under "Procedures" to correct this condition. After repair, review the Owner's Handbook information, located at the end of this bulletin, with the owner of the vehicle. Please ask the owner to inform all operators of the vehicle of this information, to help prevent future damage to the vehicle.
PROCEDURE
To repair either condition, replace the forward & reverse dog clutch sleeve and hub assembly, and the forward & reverse shift fork. Inspect the reverse driven gear and the 2nd driven gear for damage. Replace the reverse driven gear if it is damaged in the area that mates with the dog clutch sleeve. Also, inspect the other gears for possible damage. Follow procedures in the "Automatic Transaxle Out - of -Vehicle Repair" section of the "Automatic Transaxle Service Manual."
Use the Manual With the Right Hardware
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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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