K 1500 Truck 4WD V8-4.8L VIN V (1999)
Fluid - Transfer Case: Technical Service Bulletins
Transfer Case - Improved Automatic Transfer Case Fluid
File In Section: 04 - Driveline Axle
Bulletin No.: 99-04-21-006
Date: September, 1999
INFORMATION
Subject:
Improved Automatic Transfer Case Fluid
Models:
1999-2000 Cadillac Escalade
1998-2000 Chevrolet and GMC K/T 4-Wheel Drive Pickups and Utility Models
1999-2000 Chevrolet and GMC L Van Models
1999-2000 Oldsmobile Bravada
with Active Transfer Case (RPOs NP4, NP8)
Effective with vehicle production in late June of 1999, all active transfer cases on the above listed vehicles have been filled with Autotrak(R) II fluid,
P/N 12378508 (P/N 10953626 in Canada). This fluid is a light blue color rather than the red color of the previous fluids and is the next generation
Automatic Transfer Case Fluid. The fluid also contains a better friction modifier. On the models listed above, the active transfer cases should only be
serviced using P/N 12378508 (P/N 10953626 in Canada), even if the original fluid was the red Autotrak(R) fluid. The previous fluid and the new fluid
can be mixed or topped off if necessary. The new Autotrak(R) II fluid will be the only available fluid once the supply of the old red Autotrak(R) fluid is
exhausted on units older than stated above.
The Owner's Manuals and some service information will specify the incorrect fluid due to printing the information prior to the fluid change being
introduced.
Parts Information
Parts are currently available from GMSPO.
