Vibrations in rear need a direction
Just to get an understanding for my jeep. I have a 94 YJ. It has a 4.0 and its a 5 speed manual. I have installed a 4" rubicon lift, 8 degree shims , hack and tap, an xj front front shaft cut and balanced for my new rear, 33" tires, T-case drop kit, 1 1/4 lift shackles front and rear.
So now down to the problem. So when I put on the lift it had a massive vibration in the rear so naturally I needed a new to me drive shaft and went with a hack and tap. After that the vibrations went down alot but it was still there so I upped to the 8 degree shims instead of the 4s that came with the kit. This again reduced the vibrations. But it was still there at 35mph.
After some looking I seen the cv was a little close on the rotation to the knucles so I installed the T-case drop kit that came with the lift and it almost eliminated the vibes. But they were now only there at 55mph and on low rpm starts.
I was ok with it but decided have the mechanics look at it while fixing some other things. They said that I had to come up 4 more degrees on the rear axle. I told them that I have new shackles that would lift it more and they said that would give me more angle and be enough to get me in a safe operating angle. So I got the shackles yesterday and installed them.
Now the vibrations are as bad as before I installed the t- case drop kit. It looks to me like the cv is bottoming out and on load from the vehicle when driving its rubbing and causing vibes. It gets worse as speed increases. The mechanic did say my cv was going bad but this seems alot worse then a just starting to go bad CV. I took some pics and will be changing into the new CV tuesday but I was wondering what you guys think