gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

All Technical Service Bulletins for Speedometer Head: > < A/T - Overheating Diagnosis
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Speedometer Head: Customer Interest
TCC - Engages at Incorrect Speed

Number:

83-I-23

Section:

VII

Date:

Dec., 1982

Subject:

TCC ENGAGES AT INCORRECT SPEED - ALL GAS ENGINES

TO:

ALL CHEVROLET DEALERS

If a condition is encountered where the torque converter clutch is engaging at the incorrect speed, be sure to check speedometer head
magnet field plate for foreign material i.e.: grease, dirt, etc. Foreign material on the drum could change the signal to the ECM resulting in
erratic TCC operation.

All Technical Service Bulletins for Speedometer Head: > < A/T - Overheating Diagnosis