9-7X L6-4.2L (2008)
Fluid - Differential: Customer Interest
Drivetrain - Rear Differential Bind/Shudder on Turns
TECHNICAL
Bulletin No.: 08-04-20-002
Date: March 19, 2008
Subject:
Jerk/Jump Sensation with Growl/Groan Noise, Shudder, Bind From Rear of Vehicle While Turning (Drain/Refill Rear Differential Fluid)
Models:
2006-2008 Chevrolet TrailBlazer SS
2005-2008 Saab 9-7X
2008 Saab 9-7X Aero
with Limited Slip Differential (RPO G86)
Condition
Some customers may comment on a jerk or jump feeling accompanied by a growl/groan noise, shudder or bind from the rear of the vehicle while turning.
Cause
This may be caused by slip/stick of the posi-traction clutch plates. As plates slip and stick, a jump or jerk feeling occurs accompanied by a growl or
groan noise.
Correction
1.
Remove the rear differential fluid using the procedure provided in SI.
Important:
DO NOT add any limited-slip additive (friction modifier). With this new fluid (DEXRON(R) LS Gear Oil 75W-90), it is no longer required to
add friction modifier. If a friction modifier is added, it will cause the fluid to lose some of its friction reducing properties as well as reducing
seal life.
2.
Fill the differential with DEXRON(R) LS gear oil, P/N 88862624 (in Canada, P/N 88862625).
3.
Follow the procedures in SI for the 8.6 in axle on the Saab 9-7X 4.2L and 5.3L models. The lubricant levels should be between 0 mm to 10 mm (0
in to 0.4 in) below the fill plug opening.
4.
Follow the procedures in SI for the 9.5 in LD Axle on TrailBlazer SS and Saab 9-7X Aero models. The lubricant level should be between 15 mm
to 40 mm (0.6 in to 1.6 in) below the fill plug opening.
5.
Once the differential fluid is changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to allow the fluid to be worked into the
clutch plates.
Important:
If the noise condition is improved by this procedure but is not completely eliminated, it may be necessary to perform the procedure a second
time.
Notice:
There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In
this case replace the rear differential center section (differential gear case) which includes clutch plate and springs.
Parts Information
Warranty Information (Excluding Saab U.S. Models)
