I work at a GMC Dealership and have been watching for bulletins since buying my H3 last week and here is a new one:

Rear Axle Whine - keywords accelerate clunk decelerate fluid noise overheat #PIP3521A - (Sep 1, 2005)
Rear Axle Whine or Growl
2006 Hummer H3

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

Condition/Concern:
Rear axle gear whine and/or bearing growl during both drive and possibly coast conditions, which gets louder with higher speeds. This condition usually begins at 300 to 500 miles, and worsens with additional miles.

Recommendation/Instructions:
Remove the axle cover pan and inspect for black discolored fluid. The fluid may show sand particles. Closely inspect the inner diameter of the ring gear for clumps of a black sandy residue. This residue is lapping compound that was not sufficiently cleaned from the axle during the manufacturing process. If these conditions are found, the complete axle assembly should be replaced, because all moving parts of the axle will be affected by the lapping compound residue.

Use part number below or any number that these supersede to. The Broadcast Code, HL1 or HL2 for example, can be found in VIS under Vehicle Component.

Description
Broadcast Code
Part Number

Standard Axle Assembly
HL1 or FD3
15822875

Electronic Locking Axle Assembly
HL2 or FD4
15822875


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.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.

I work at a GMC Dealership and have been watching for bulletins since buying my H3 last week and here is a new one:

Rear Axle Whine - keywords accelerate clunk decelerate fluid noise overheat #PIP3521A - (Sep 1, 2005)
Rear Axle Whine or Growl
2006 Hummer H3

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

Condition/Concern:
Rear axle gear whine and/or bearing growl during both drive and possibly coast conditions, which gets louder with higher speeds. This condition usually begins at 300 to 500 miles, and worsens with additional miles.

Recommendation/Instructions:
Remove the axle cover pan and inspect for black discolored fluid. The fluid may show sand particles. Closely inspect the inner diameter of the ring gear for clumps of a black sandy residue. This residue is lapping compound that was not sufficiently cleaned from the axle during the manufacturing process. If these conditions are found, the complete axle assembly should be replaced, because all moving parts of the axle will be affected by the lapping compound residue.

Use part number below or any number that these supersede to. The Broadcast Code, HL1 or HL2 for example, can be found in VIS under Vehicle Component.

Description
Broadcast Code
Part Number

Standard Axle Assembly
HL1 or FD3
15822875

Electronic Locking Axle Assembly
HL2 or FD4
15822875


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.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.

Cool, could you post any others when you have a chance.

Hello, that's been discussed here and is a few weeks old.