Transfer Case Shudder Or Bind On Turns In 4HI - keywords auto AWD crow hop NR4 NR6 stuck
| Subject: | Transfer Case Shudder or Bind on Turns in 4HI |
| Models: | 2003-2006 Cadillac Escalade Escalade ESV, Escalade EXT |
| 2003-2005 Chevrolet Suburban, Tahoe |
| 2003-2006 GMC Yukon, Yukon Denali, Yukon XL |
| 2003-2007 Hummer H2 |
| 2006-2007 Hummer H3 |
| Equipped With a Borg-Warner Transfer Case (RPO - NR4 or NR6) |
This PI is being superseded to add diagnostics for vehicles equipped with a manual transmission. Please discard PIP3045D.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Concern of shudder or bind on turns in 4 HI "auto" position on vehicles equipped with Borg Warner 4482, 4484, 4493 or 4494 transfer case.
Note: A shudder or bind felt in "lock mode" would be considered an operating characteristic per the latest version of tsb 01-04-18-001 the concern should not be present in 4hi (unlock) or auto mode.
Recommendation/Instructions:
Place the automatic transmission in park or if equipped with a manual transmission shift to reverse. Raise the vehicle and attempt to spin either prop shaft by hand. If the prop shafts cannot be rotated by hand, remove the transfer case and inspect the lock up mode shift fork assembly for being damaged. A damaged fork assembly could cause the transfer case to be in lock up mode at all times.
If both prop shafts spin by hand with transmission in park, perform further diagnosis for root cause of bind including swapping the wheels and tires from an identical vehicle that does not exhibit the concern (for testing purposes).
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.
