Driveline - Center Bearing Wear and Driveline Noise
88chevy25GMC NUMBER: 88-T-176
GROUP: 4A - Propeller Shaft
DATE: November, 1988
CORPORATE
NUMBER: 864103
SUBJECT: CENTER BEARING ISOLATOR WEAR AND PROP SHAFT NOISE
MODELS: 1988 K EXTENDED CAB
The rear propeller shaft in the 1988 K extended cab is a steel two piece design with a center bearing. As the suspension articulates, the shaft between the transfer case and the center bearing may be drawn rearward causing contact with the center bearing isolator. The result could be a noticeable noise and center bearing wear. The 2 piece propeller shaft in the 1989 K extended cab has been redesigned. The new center bearing has a rear extension. The transfer case to center bearing prop shaft has a necked down 3" spline and the rear prop shaft has a pop-on seal in front of the slip yoke. When encountered, center bearing isolator wear and prop shaft noise in 1988 K extended cab can be corrected by replacing the two rear propeller shafts and center bearing using the new design (1989) parts and the procedure in the 1988 C/K Service Manual, Section 4A.
Parts
Front Rear
Propeller Shaft Propeller Shaft
Model Part Number* Part Number
K10953-M20 15622415 15622431
K10953+M20 15622417 15622427
K20953 15622417 15622428
K30953-RO5,-L19 15622417 15622428
K30953-RO5,+L19 15622417 15622429
* Front Propeller Shaft P/N includes Center Bearing
Note: M20 = 117 mm 4 Spd. Transmission R05 = Dual Rear Wheel L19 = 7.4L TBI
Parts are currently available from GMSPO.
For vehicles repaired under warranty, use:
Labor Op: F1280
Labor Time: 1.1 hr