Transfer Case Clunk During Acceleration and Deceleration. Chevrolet TrailBlazer

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2005 🢒 TrailBlazer - 4WD 🢒 Driveline/Axle 🢒 Transfer Case - NVG 126-NP4 🢒 Transfer Case Clunk During Acceleration and Deceleration

Cause

Correction

DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case when it is in AWD mode.

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

Incorrect fluid level or incorrect fluid

•	Inspect the transfer case for the correct fluid level. Refer to Transfer Case Fluid Replacement .

•	Fill the transfer case to the correct fluid level, if required.

•	Inspect the transfer case for the correct type of fluid

•	Flush the transfer case and fill with the correct fluid, if required.

Excessive clearance between the slip yoke and the rear output shaft

•	Inspect the slip yoke splines for wear.

•	Inspect the rear output shaft splines for wear.

•	Replace the slip yoke if faulty. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.

•	Replace the rear output shaft if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 126-NP4 Unit Repair.

Excessive clearance between the slip yoke and the rear bushing

•	Inspect the rear bushing for visible signs of wear.

•	Inspect the slip yoke bushing journal for wear.

•	Replace the slip yoke if faulty. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.

•	Replace the rear bushing if the bushing is worn. Refer to Rear Output Shaft Seal Replacement .