TSB #18-005-03 Covers a reprogram of the trans downshifting that might fix the clunking problem.

Some dealers have also blamed the slipyoke being dry and regreased it to fix the problem.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

Had the clunck, convinced the dlr to grease the slip yoke. He did it twice over the last 10k miles. Both times the clunck stopped until it rained torrentially then it came back. This week he ordered me a new drive shaft since I will be out of warranty by next service and he wants to try to fix the issue. I'll let u know.....

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'03 Rennie w/all Tupperware
Custom Roof Basket
Mopar Tubular Brush Guard
Garmin GPS V & Laptop w/Nav software
RAM products laptop mount
Maglite w/mount
Rear cargo bay tool cabinet
AllJs Rear Shelf
Rear receiver
250k miles!
LOST #CR051230