nothing special

Document ID: 2067499
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#PIP4349: Moan Groan Noise From Manual Transaxle - keywords apply differential howl slip - (Feb 19, 2008)


Subject: Moan Groan Noise From Manual Transaxle


Models: 2004-2008 Chevrolet Cobalt SS

2008 Chevrolet HHR

2004-2007 Saturn Redline

Equipped With RPO MU3 Manual Transmission and RPO G85 Limited Slip Differential.




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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may comment about a moan or groan noise coming from the transaxle under specific conditions.

Recommendation/Instructions:
The noise can be easily reproduced by placing the two front tires on surfaces with different traction capabilities and lightly accelerating or during hard cornering when accelerating. As the front wheels and tires begin to spin at different speeds, the noise will occur. This noise occurs when the limited slip differential is directing the torque from one front wheel to the other front wheel.

This moan/groan noise is a normal event, and the vehicle requires no repair by the dealer. The technicians should test drive the vehicle to verify the noise does not occur when accelerating on pavement without spinning the tires, and then he/she should advise the customer of the above information.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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that sucks

 

I get that noise, good to know it isn't something major......

 

yes, good to know, i've heard it in both my quaife LSD transmissions that i've had

 

10-4 me too and i didnt worry about it as it was evident what was happening - slippery road patches and heavy right foot jerk driver (me) and quaife said "WTF squawk"

 

i also have that noise, for some reason i knew it was the LSD. when that sound happen i have one wheel on the ice and on the pavement or whatever.

 

Newb question here.. does the LSD require additional friction modifier additive?