I just bought a 2004 Jeep TJ to replace my YJ. I seem to have a vibration under load. Mostly from 40mph to 70mph. It is noticible on the freeway the most when it is in overdrive (auto trans) going up a slight hill. I have replaced the U joints, Trans mount, and put cam bolts in to adjust the Axle so the drive shaft angle is correct. The shop is telling me that it is the tires I have on the jeep. The tires are ProComp Mud Terrain 33 x 12.50. Does that sound correct to anyone? If I am driving on the highway and I go over a bump the noise changes if the back end of the jeep is going up and down as well. Looking for help, Thanks
I put on the 7 inch fender flairs already so they cover the tires perfectly. The The noise is a constanct noise so it is not the tires bottoming out or rubbing. 4wheelsParts people are telling me me it is the aggressive tread design on the tires. I don't know what it sounded like with other tires since the tires were on there when i bought it. Still not sure, only thing left is the pinion bearing, carrier bearings and or axle bearings unless anyone else has a suggestion.
I know this is an old topic but hopefully you found the problem. I think I have the same one. My tires are 33" BFG AT's. 4" lift, SYE etc (in my profile). I tried swapping drive shafts, moving adjustable upper rear control arms in and out. The vibration is felt in the tub, seat, center console. I do not feel it coming through the shifting lever (mine also Auto Trans). Was gonna try trans mount next.
I dont see many people posting what "fixed" their vibe problems. So here is what fixed mine. After doing the transmission mount (it helped a little, and mine was worn out) I took a closer look at my driveline angle. I adjusted the axle/pinion to be inline with the drive shaft (pointing directly at the DC joint) and the vibration is now 99% gone. I can live with this. I will check it with an angle finder soon and adjust as needed. Good luck.
This is to jleslie and OP, while I have not personally felt the ride of either of your tires but I can't imagine that your vibes are coming from the tires... If that was the case you wouldn't have a vibration at all, you would have a distinct hum, or drone sound. The only tires I would think would give you an actual vibration are boggers or similar tires.