Colorado 4WD L4-2.9L (2008)
Constant Velocity Joint Boot: Customer Interest
Drivetrain - Front Axle Rubbing/Moaning/Growling Noises
ENGINEERING INFORMATION
Bulletin No.: 08-04-19-002C
Date: March 11, 2010
Subject: EI08197 - Front Axle Rubbing, Moan or Growl Noise in 2WD May Not Occur in 4WD (Replace Left Front Wheel Drive Shaft Inner Joint
Boot)
Models:
2008-2010 Chevrolet Colorado
2008-2010 GMC Canyon
Equipped with 4WD and Built Prior to October 28, 2009
Supercede:
This bulletin is being revised to provide a build date. Vehicles built after that date were corrected in production. Please discard Corporate Bulletin
Number 08-04-19-002B (Section 04 - Driveline/Axle).
Condition
Some customers may comment on a rubbing, moan or growl noise from the front of the vehicle. The condition may be described as a noise that phases
(cycles) in and out. The noise typically occurs in 2WD and is eliminated when shifted to 4WD.
Cause
This condition may be caused by a left front wheel drive shaft (halfshaft) with an inboard stroke position that is too long. When the shaft was assembled
during manufacture, the inner joint and boot may have been extended too far, trapping excessive air inside the boot when the clamps were installed. This
condition could result in the shank of the inner joint of the shaft contacting and rubbing on the intermediate front wheel drive shaft in the front axle. This
condition could be more common at high altitudes, because the difference in air pressure between the inside of the boot and the atmosphere would be
greater, increasing the contact force between the two components.
Correction
Half-shaft
Intermediate Shaft
Verify the condition by removing the left front wheel drive shaft (halfshaft). Inspect the end of the halfshaft and the intermediate front wheel drive shaft
for evidence of contact, as shown in the pictures above. It is not necessary to replace these components because of this wear.
