I'll make this as short and sweet as possible with all the info.
Bought a XJ back in February, love it, it had RC 4.5" lift with 33's. Took it and added 1.75" coil spacers/shackles. (Wouldn't clear the 33's on 4.5")
First time I stuffed it in the woods the RC leafs crapped out. Sagged on right rear side.
Bought Rusty's 4.5" leafs - they have 6 leafs compared to RC's 5. Sag is gone...RC leafs did have pinion angle shims under them - they were aluminum. They snapped when I took them off the RC leafs to try to put under the Rusty's.
From what I can see the Jeep does not have a SYE kit, it has a TC drop.
TC drop bushings measure 1-3/8"
Total suspension lift sits at ~6.25" suspension
Jeep is all back together and I really don't drive it unless I either want to be out in the woods or take it around town. I never usually go more than 55MPH, barely ever ends up on the freeway.
<55 I experience almost no vibration, if anything I think it comes from the tires. From what I vaguely remember, on the freeway I feel a little vibe around the 60MPH mark?
I don't want any issues so if I need shims I want them installed and I don't want to play a guessing game with what degree shims I'll need. I was told to put the shims that were under the RC leafs back under the Rusty's leafs here on the forum, but as I said they broke and I'm not sure if the difference in leafs makes them useless anyway...
I followed the directions in this article and got the following measurements:
Not on the flat part of the yoke, the driveshaft itself right before the rear CV shafts/yoke
Rear diff: 6*
Transfer case drain bolt: 7*
What I do from here is unclear in the article...I'm not sure if I add them up and divide by 3 for an average of ~12* shims...? Seems high...
22-6-7 = 9/3 = 3* shim?
Math was never my strong point and the article is a little vague...
Sorry this ended up long anyway...help is appreciated.