EI08268 - Binding or Crow Hop from Rear Wheels When Turning
| Subject: | EI08268 -- Binding or "Crow Hop" from Rear Wheels When Turning (Engineering Information) |
| Models: | 2008 Chevrolet Silverado 2500HD and 3500 Series Only |
| 2008 GMC Sierra 2500HD and 3500 Series Only |
| Equipped with 6.6L Diesel Engine (VIN 6 -- RPO LMM) and 11.50" Rear Axle with Locking Differential (RPO G80) |
| Attention: | Dealer in U.S. and Canada Only -- Proceed with this bulletin ONLY if the customer has commented about this concern and the EI number is listed in GMVIS. Otherwise, disregard the bulletin and proceed with diagnostics found in published service information. THIS IS NOT A RECALL. Refer to Corporate Bulletin Number 04-00-89-053B for more details on the use of Engineering Information Bulletins. |
Condition
Some customers may comment on a binding feeling or "crow hop" condition from the rear wheels, or that it feels like the rear differential is locking up on turns.
What Action to Take
Important: This request only relates to pickup trucks with 11.50" rear axle equipped with the G80 Locking Differential.
GM Engineering is attempting to determine the root cause of the above condition. GM Engineering would like to receive product feedback on 2008 Chevrolet Silverado and GMC Sierra 2500HD and 3500 Series vehicles exhibiting a binding condition from the rear axle assembly that have not been serviced previously for this condition. This condition may be caused by the locking differential staying engaged after a locking event. This information will be used by engineering to "root cause" the customer's concern and develop/validate a field fix.
Instructions
Important: DO NOT attempt to repair or service the rear axle assembly. It is important that the rear axle is not disturbed.
If a vehicle is encountered with the above concern, and the condition is duplicated at the dealership, please follow the steps listed below. GM Engineering may want to visit dealers located within a certain area.
- Record the VIN.
- Record the vehicle build date.
- Record the mileage at the time of service.
- On four wheel drive vehicles, confirm that the binding condition is coming from the rear axle assembly and is not a transfer case issue.
- Verify that the rear axle has not been serviced previously for this condition.
- Record in detail how the condition was duplicated.
- Contact one of the people listed below for additional instructions.
Contact Information
Eric Leigh @ (586) 492-6107
Rich Burrell @ (586) 947-5740 (Alternate Contact)
If the engineer is unable to take your call, please leave the following information in a message:
| • | Technician Name |
| • | Dealer Name and Phone Number |
| • | Complete VIN and Repair Order Number |
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information found in SI.
Warranty Information
Please claim the following labor operation number when complying with this Engineering Information request.
Labor Operation | Description | Labor Time |
|---|---|---|
F2223 | Case, Rear Differential -- Replace | Use Published Labor Operation Time |
