I have a feeling some of it may be caused by surface rust on the driveline, since the drive is now sitting at a different angle than before, it may be wearing off rust that it never had contact with before, on my old explorer I had to replace one of my half shafts with one that had been sitting in a shed for a long time, at low speeds if I nailed the gas it shook like a mother for a while because it had a bunch of surface rust on one side of it.

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L.O.S.T.# AM091337
2006 Voodoo Edition
EVIC
Franken/Jacked
265/75 Duratracs
Skid Row Skids
RED LED Overheads and Footwells
Custom TJ Bumper
4x 100w Hellas on rack
Nokya Hi-Watt headlight bulbs
Blacked Stockers
Thrush Welded muffler
K&N Filter
Custom Boiler Rack

Soon:More Lights, ARB/Winch

hopefully you already checked the driveline for mud and dirt and what not?

i had a similar problem, i hada bout 5 lbs of mud crammed between one of the front shafts and the framing around the diff

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03 Renegade (Black)
177k miles 3.7L gas - 45RFE
Command Trac / 4.10s
Lift: ft. 790+ rr. JBA4+
The last of the TrailReady Front&Rear Bumpers and TR Rock Rails
Jarhead Offroad light covers
31x10.5R15 RedLetter Grabbers on Blackrock Dunes
L.O.S.T #KD098632

I think his only off road so far has been through the back yard, it was REAL clean underneath!

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Yes it is very clean. Well, it was before I drove to your house on that new road. I pressure washed under there best I could blind at the carwash, but I think this weekend I'm going to get under there with a bucket and handwash my undercarriage...

I'm not too worried about the vibration now. Just happening at 50 @ 4k rpms is better than the day I drove home, where it basically did it any time I pushed on the gas pedal.

I'll just keep an eye on it this week, next weekend I'll probably get under there and put a wrench on any thing I can find. I really doubt that is the problem, but it gives me a reason to be in the garage.

Tonights swapping of the air filter, checking fluids and tire pressures just didn't do it for me...at least I've got an oil change coming up in 900 miles. That might tide me over for a couple days.

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2005 KJ Renegade
Fabrications for sale: Aluminum Roof Rack (See Page 9)
Aluminum Gas Tank Skid -- Radiator Skid -- Front Strut Shims
Coming Soon: Rear Bumpers with lots of options