CHEROKEE LIFT PROBLEMS

I HAVE A 79 CHEROKEE WHICH I JUST BOLTED UP 4" SPRINGS TO.  THE PROBLEM I AM NOW HAVING IS THAT ONE THE BOLTS ON THE SPRING CLAMP HIT THE FRAME.  I CALLED THE STORE WHERE I BOUGHT THEM THEY SAID I HAD THEM ON BACKWARDS.  BUT I HAVE THE SHIM FACING FOWARD (BIG PART TOWARD THE BACK) JUST LIKE THE INTRUCTIONS AND THIS IS HOW I HAVE SEEN IT ON ALL THE OTHERS I HAVE LOOKED AT.  THE OTHER PROBLEM I AM HAVING IS THAT THERE IS NOW A VIBRATION IN IT WHEN I DRIVE.  IT HAD THE LIFT ON BEFORE I JUST CHANGED THE SPRINGS TO GET RID OF THE SAG ON ONE SIDE (WHICH IT DIDN'T) AND THERE WAS NO VIBRATION BEFORE AT ALL.    THANK YOU FOR YOUR HELP FIREMAN

Edited 8/26/2006 9:38 pm by FIREMAN91186

A question, is this a spring over conversion? I have owned a 79 J20 for over 20 years so I know the front end well. If it is a spring over I can see where ubolt studs could hit frame. Hack saw them off flush with bolts if this is the case. On the vibration, this is because of front Ujoint angle. The cheeroke does not take well to lifts in this regard because the front output shaft is well up in frame so it has to be bent down a lot and ujoints are not constant veleocity and you get vibration. Two things you can do here. The first is to get some alignement shims to place between spring and axle to tip it further forward (raise input yoke) to reduce the angle on front drive shaft. The second option is to have a driveshaft shop install a aftermarket CV joint in the front of drive shaft wher it connects to drive axle. The latter one is the better solution and a combination of both the best solution.

I FORGOT TO WRITE THIS IN THERE BUT THIS IS THE REAR AXLE THE FRONT 4" SPRINGS WERE FINE.  

No surprize for to reasons. One the rear drive shaft is longer so there is less angle and the engine/tranny/Tcase combo is tilted down toward rear so this is less angle problem. Also the rear drive shaft has two ujoint 90 degress apart in phasing so they cancel each other out if same basic angle are on both ends. (you do not have this in front)You are have ujoint angles problems in the front and it is quite common when people do not take this into account and properly deal with it. If you follow me earlier posted advise, it will cure your vibration.