K 2500 Truck 4WD V8-379 6.2L DSL (1988)
Pressure Plate: All Technical Service Bulletins
M/T Clutch - Shudder or Chatter on Launch
GMC NUMBER:
90-7C-91
GROUP:
7C CLUTCH
DATE:
SEPTEMBER, 1990
CORPORATE
NUMBER:
067302
SUBJECT:
CLUTCH CHATTER/SHUDDER ON LAUNCH
MODELS:
1988-90 C/K TRUCKS EQUIPPED WITH 5.7L AND 6.2L ENGINES 4-SPEED AND 5-SPEED MANUAL TRANSMISSIONS
Some 1988-90 C/K trucks equipped with 5.7L and 6.2L engines with 4-speed and 5-speed manual transmissions may experience a condition of chatter or
shudder on launch. Revised clutch discs and matching pressure plates have been released for these vehicles and are available through GMSPO. The
installation of these parts will provide significant improvement in the involved vehicles.
DATE OF PRODUCTION CHANGE Revised pressure plates were installed shortly after the start of the 1990 model year. Revised clutch discs will be
installed at the start of the 1991 model year.
SERVICE PROCEDURE 1988 OR 1989 MODEL: The pressure plate and clutch disc should be replaced at the same time as the parts have been
designed to work together
1990 MODEL: These vehicles should require a new clutch disc only. However, when the pressure plate is removed inspect the cover for a manufacturers
name stamp. If the name Valeo appears on the pressure plate cover the pressure plate is of the revised design and does not need replacement unless
damaged. If the name Borg and Beck
appears on the pressure plate cover the pressure plate assembly requires replacement. Only very early production 1990 vehicles may be equipped with
Borg and Beck pressure plates. Refer to section 7C of the appropriate service manual for clutch disc and pressure plate replacement procedure.
SERVICE PARTS INFORMATION
Pressure
Clutch
Engine
Transmission
Plate P/N
Disc P/N
5.7L
5 Speed
15638388
15668525
5.7L
4 Speed
15638388
15668526
6.2L
4 Speed
15638388
15668525
Parts are currently available through GMSPO.
WARRANTY INFORMATION For vehicles repaired under warranty use:
Labor Operation:
K0800
Labor Time:
Use appropriate labor time in the labor time guide.