So I have a 2007 JKU with the 5" Fabtech Long Arm kit and Mickey Thompson 37's. My problem in lies in here. I am running the factory D30 front D44 rear and I experience vibration at roughly 1500 RPM and 2000 RPM but it isnt consistent. It is a pretty violent shake that goes away with decelleration and acceleration. It returns sperratically. My housing on the D30 is possibly bent but I'm not so sure anymore since this isn't a constant vibration. If anybody has had a similar problem any insight would be greatly appreciated. Thanks in advance

 

well, i would start with the basics - try removing your front drive shaft and see if that helps. if it does, you just need to get it rebalanced. if not, we can go from there.

 

Is the vibration similar to the feeling of driving on washboard road? Does it only happen under load and NOT when in neutral and revving at 1500-2000 RPM? I've had a similar problem for months with my 07 JKU. Vibration begins when driving at around 40 mph and 1500 RPMs. It goes away when I step on the gas, upping the RPMs. There's at least one other forum member that has had a similar problem. I've not been able to diagnose the problem. I've had my tires balanced but this did not solve the problem. I removed the both driveshafts (at different times obviously) and still had vibrations. Sorry dont have an answer for you but at least you are not alone. Maybe if enough of us are experiencing the problem, we'll come across an answer. FYI here's the link to the other similar sounding shake problem: https://www.jk-forum.com/forums/show...light=jk+shake

 

Think I figured it out, I think its my rear spider gears (the small gears in the center of my rear diff) are eating themselves so I am emailing Offroad Evolution for a gear swap and see if that fixes my problem.