hi guys, new to the forum here, long time jeeper, many yj`s, tj`s, and few stock xj`s,i lifted my 2001 xj 4.5",and it`s the only one in 18 years that has been givin me problems,,,, TC dropped, SYE in place, short arms replaced, but still got a loud rumble and slight vib that seems to be coming from the front, any clues? i will take the front drive shaft out today and go fo a spin and see, more than likely it`s the problem. thanks.

 

Hi and welcome to CF from Tj...You may need LCA's & UCA's to get the pinion angle better. I have a 4 1/2 and needed to replace the LCA's to get the vibration out...Tj

 

Most likely the double cardon on the front drive shaft. Put it in 4 low and drive up a steep incline very slowly. If you hear/feel the Rumble 3-4 times for every rotation of the tires then that's your culprit.

 

it says in his post he did replace them. yea check ur front ds

 

also forgot to mention that the noise/rumble(loud) it`s at high speed only 65-80mph. slight vibs between 30-45mph then steady with the rumble noise. LCA`S and UCA`s have been replaced.

 

A buddy had he same prob, we popped his drive shaft out and the vib was gone. We checked the yolk on the front axle and had a boat load of slop.He got a good deal on d30 so we swapped and the vibe is gone.

 

thanks will try that.

 

I just got a rumbling vibe from what I believe is on the front driver side tire. I'll try to take a look at it tomorrow and see what I come up with. It doesn't pull and is really only noticeable at slower speeds.

Edit: I have a full traction LA lift... How do you tell if the uca and lca are at fault? What exactly should I look for. I only ask because someone posted that this was a problem.