GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: During acceleration or underload, the transfer case jumps out of gear.

Review the Symptoms - Transfer Case and perform the necessary inspections.

Melted fork pads

Replace the fork pads or other damaged components. Refer to Transfer Case Assemble in Transmission/Transaxle/Transfer Case Unit Repair Manual.

Faulty high speed teeth on range sleeve

Inspect the planetary carrier high speed teeth for damage.

Replace the range sleeve if the teeth are faulty. Refer to Transfer Case Assemble in Transmission/Transaxle/Transfer Case Unit Repair Manual.

Faulty range fork

Inspect the range fork for damage and replace the range fork if it is damaged.

Range fork bushing and springs

Inspect the range fork springs for being faulty. Refer to Transfer Case Cleaning and Inspection in Transmission/Transaxle/Transfer Case Unit Repair Manual.

Inspect the range fork shaft bushing for wear. Refer to Transfer Case Cleaning and Inspection in Transmission/Transaxle/Transfer Case Unit Repair Manual.

Synchronizer clutch gear

Inspect the synchronizer clutch gear for worn teeth. Replace the synchronizer clutch gear if it is faulty. Refer to Transfer Case Assemble in Transmission/Transaxle/Transfer Case Unit Repair Manual.