Transfer Case - Low Fluid Level/Transfer Case Overfilled

File In Section: 7 - Transmission

Bulletin No.: 86-74-04

Date: September, 1998

Subject:
Low Transmission Fluid Level, Transfer Case Fluid Overfilled
(Replace Transfer Case Input Shaft Seal)

Models:
1996-98 Chevrolet and GMC K1-2, T1 Models
with NP231, NP233, NP241, NP243 Transfer Case (RPOs NP1, NP2)

Condition

Some owners may comment about a low transmission fluid level or that the transfer case fluid is overfilled. In some cases, there may be no external leaks apparent. On vehicles equipped with an automatic transmission, some owners may comment about delayed engagement or transmission not shifting properly.

Cause

The above conditions may be caused by a damaged transfer case input seal. This seal damage may allow transmission fluid to enter the transfer case.

Correction

Replace the transfer case input shaft seal and inspect the transfer case input gear for possible signs of damage such as roughness, scratches, or dents. Also, inspect any seals taken from dealer inventory for signs of cut or damaged sealing lips. Verify that the transmission fluid and transfer case fluid are at the proper levels. Correct as necessary. Refer to Section 4 - Driveline/Axle in the appropriate Service Manual. Use the part number listed below.

Parts Information

P/N Description Qty

14095609 Seal, Transfer Case Input Shaft 1

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor
Operation Description Labor Time

Gasket, Transfer Use published
K4250 Case to Adapter - labor operation
Replace time

Important:
Labor operation is coded to base vehicle coverage in the warranty system.