Transfer Case - Binding or Shuddering
File In Section: 06 - Engine/Propulsion SystemBulletin No.: 99-06-04-056
Date: November, 1999
INFORMATION
Subject:
Diagnostic Information for Transmission Binding and Shuddering
Models:
1999-2000 Chevrolet and GMC L Van
1998-2000 Chevrolet and GMC S/T Models
1998-2000 Oldsmobile Bravada
With NVG 136 and NVG 236/246 Automatic Transfer Case (RPOs NP4 and NP8)
The following information should be used when diagnosing a binding or shuddering transmission condition. To prevent unnecessary warranty expenses, the following should be observed.
Before any repairs are made to correct this condition, verify the front propeller shaft speed sensor (6) and the rear propeller shaft speed sensor (3) connectors are correctly installed. Refer to the tables to compare wire colors. If the connectors are found to be installed incorrectly, swap the connectors and verify wiring harness routing.
Front Propeller Shaft Speed Sensor Connector
Pin Wire Color Circuit No.
A YEL 400
B PPL 401
Rear Propeller Shaft Speed Sensor Connector
Pin Wire Color Circuit No.
A LT BLU 2221
B DK GRN 2222