| 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® 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® fluid. The previous fluid and
the new fluid can be mixed or topped off if necessary. The new Autotrak®
II fluid will be the only available fluid once the supply of the old red Autotrak®
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.
