| Subject: | Revised Transfer Case Disassemble and Transfer Case Assemble
Procedures |
| Models: | 1999-2000 Cadillac Escalade |
| 2002 and Prior Chevrolet Astro, Blazer, S-10, Silverado, Suburban, Tahoe |
| 2002 and Prior GMC Jimmy, Safari, Sierra, Sonoma, Yukon, Yukon XL |
| 2001 and Prior Oldsmobile Bravada |
| with NVG 136 (RPO NP4), NVG 236 (RPO NP8) or NVG 246 (RPO NP8) Transfer Cases |
This bulletin is being issued to revise the Transfer Case Disassemble and the
Transfer Case Assemble procedures in the Transfer Case sub-section of the Unit Repair
Manual. Please replace the current information in the Unit Repair Manual with the
following information.
The following information has been updated within SI. If you are using a paper
version of the Unit Repair Manual, please make a reference to this bulletin on the
affected page.
The rear output shaft has a design change for model year 2003. The new design
rear output shaft will be the service replacement parts for the original design rear
output shaft for prior model years. The old P/N 12547489 (2) will be replaced
with new P/N 88984303 (1). The shoulder for the oil pump can identify the shafts.
This is not an enhancement to the performance of the transfer case. The rear output
shaft should only be replaced if found faulty during reconditioning of the transfer
case. The replacement rear output shaft will require a different service procedure.
Old and New Mainshaft Stack Up
