K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Carrier Side Gears: All Technical Service Bulletins
Drivetrain - Front Axle Growl Noise in 2wd Only
GMC NUMBER:
89-4C-133
GROUP:
4C Front Axle
DATE:
June, 1990
CORPORATE
NUMBER:
064301
SUBJECT:
FRONT DIFFERENTIAL GROWL NOISE
MODELS:
1988-89 K1, K2 TRUCKS
Front axle growl noise due to improperly machined side and differential gears may be evident in some 1988-89 K1 and K2 vehicles. Affected vehicles
can be repaired by replacing the front axle side and differential gears only when all of the following criteria are true.
1.
Growl noise happens in two wheel drive only. Subject noise will not be evident when the truck is in four wheel drive.
2.
The noise is intermittent - the growl will not always be present under the same conditions.
3.
Putting pressure (pulling back) on the transfer case shift lever causes the noise to go away.
If all of these conditions are not present, do not attempt this repair procedure as it will not yield the desired result.
Figure No. 1
Repair Procedure:
Replace the front axle side gears as shown in section 4C of the applicable model year unit repair manual. Refer to Figure 1.
Important
The new front differential gear service kit has non-identical side gears. The bell end has a ring, output shaft connector (snap ring) and the flange end has
a straight spline with no snap ring.
SERVICE PARTS INFORMATION
Part Number
Description
26022410
Gear Service Kit (2 side gear
assemblies, 4 thrust washers, pin-
ion shaft, and pinion shaft lock
pin)
Parts are currently available through GMSPO.
WARRANTY INFORMATION For vehicles repaired under warranty use:
