DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in the 4LO range only.

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

High/low planetary carrier assembly

1. Inspect for the following conditions:

•	Excessively worn planetary gears

•	The planetary gears loose in the planetary carrier

•	The input shaft for missing thrust washers or excessive thrust end play in the carrier

•	Excessively worn high/low clutch engagement teeth on the carrier

•	Refer to High/Low Planetary Carrier Cleaning and Inspection .

2. Replace the high/low planetary if any of the above conditions are found. Refer to Transfer Case Disassemble and Transfer Case Assemble .

High/low internal gear

1. Inspect the high/low internal gear to front case fit for any looseness.
2. Replace the front case half if the high/low internal gear is loose. Refer to Transfer Case Disassemble and Transfer Case Assemble .

High/low clutch

1. Inspect the high/low clutch engagement teeth for excessive wear.
2. Inspect the high/low clutch to rear output shaft splines for excessive wear.
3. Replace the high/low clutch if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .