DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in the 2HI mode.

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

Incorrect fluid level or incorrect fluid

1. Inspect the transfer case for the correct fluid level. Refer to Transfer Case Fluid Replacement .
2. Inspect the transfer case for the correct type of fluid.
3. Flush the transfer case and fill with the correct fluid, if required. Refer to Transfer Case Fluid Replacement .

Excessive clearance between the slip yoke and the rear output shaft

1. Inspect for the following conditions:

•	Worn slip yoke splines

•	Worn rear output shaft splines

2. Repair or replace the following components if faulty:

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

•	Replace the rear output shaft, if required. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 246-NP8 Unit Repair.

Excessive clearance between the slip yoke and the rear bushing

1. Inspect for the following conditions:

•	Worn rear bushing

•	Worn slip yoke bushing journal

2. Repair or replace the following components if faulty:

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

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

Worn high speed teeth on the range sleeve

1. Inspect for the following conditions:

•	Worn high speed teeth on the range sleeve

•	Worn or missing input gear thrust washers

•	Refer to Transfer Case Cleaning and Inspection in Transfer Case - NVG 246-NP8 Unit Repair.

2. Repair or replace the following components if faulty:

•	Replace the range collar if it is worn. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 246-NP8 Unit Repair.

•	Replace the thrust washers as required. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 246-NP8 Unit Repair.

Rear output shaft bearing outer retaining ring

1. Inspect for the following conditions:

•	Proper installation of the rear output shaft bearing retaining ring

•	Excessive wear or damage to the retaining ring groove in the rear case half

2. Repair or replace the following components if found faulty:

•	Properly install a new rear output shaft bearing outer retaining ring.

•	Replace the rear case half if the retaining ring groove is excessively worn.

•	Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 246-NP8 Unit Repair.