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Driveline - Torsional Vibration

87chevy11

GMC NUMBER:

GROUP: 7B - Manual Transmission

DATE: July, 1987

CORPORATE
NUMBER: 767201
SUBJECT: DRIVELINE TORSIONAL VIBRATION

MODELS: 1984-1987 S/T TRUCKS WITH MANUAL TRANSMISSIONS


THIS BULLETIN CANCELS AND SUPERSEDES TRUCK SERVICE

BULLETIN 86-B-22 DATED DECEMBER, 1985, ALL COPIES OF WHICH

SHOULD BE DESTROYED.


Some 1984-87 S/T trucks that experience driveline torsional vibration (noticeable at low engine RPM) may be repaired by installing a revised clutch plate, which incorporates a longer dampener travel to remove vibration.

P/N 15608690 Plate Assembly 2.5L (LN8)
P/N 15608691 Plate Assembly 2.8L (LL2)

The above parts will be incorporated into production with the start of 1988 model year trucks.