Rear Differential Clutch Pack Stack Height Change - keywords axle bind chatter shudder

This PI is being superseded to correct models and recommendation. Please discard PIP3892A.

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

When replacing the rear differential clutch packs in a 2006-2007 Chevrolet Corvette Z06 or 2007 Cadillac XLR, technicians may find a different number of clutch plates and friction material in the service parts compared to what was removed.

1. 2007 XLR & ZO6 and 2006 ZO6 built after June 6 have 7 active surface (per side) carbon differential plates. These have a total plate count of 8 per side (1-one sided friction plate, 3-two sided carbon friction plates, and 4 steel plates).
2. ZO6 before June 6 build have 9 active surface (per side) bronze differential plates. These have a total plate count of 10 per side (1-one sided friction plate, 4-two sided bronze friction plates, and 5 steel plates).
3. Stack height between 9 plate bronze and the 7 plate carbon is identical.

Note: This change does not apply to the non-Z06 Corvette or XLR-V.

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.