What shim do I need for my rear axle?

I'm getting ready to modify my 98 xj (auto/231/d35)...
At the end of the day I'm going to be sitting about 4.25" higher than stock, this includes a new bastard pack and a rear shackle being about 1" longer than stock. I'm also doing a hack n tap... My question is what angle shim do I need at the rear axle if any? I know with the sye you want to point the yoke more toward the output on the transfer case, and I know a longer shackle will help point it up a little....

Also, where can you find a shim (or other leaf spring parts such as centering pins/ clips/ etc) locally? Does autozone or napa have these parts in stock? Maybe 4-wheel parts?

Thanks,

mike

4wp parts carries the alum shims from procrap but i wouldnt run em. I would first do the lfit setup without shims then make sure the rear axle's pinion points about 2 degress lower than the driveline. you may not need anything at all. I'm at almost 6" with my 8.25 using no shims and its just right

, Use an angle finder to compare both ends, divide the difference in 1/2 & get the shim closest to what you come up with, minus the 2 degrees for pinion shift .

Also, use the steel shims that bolt into the sping pack. Any good off road shop will stock them. You can buy them direct from Rubicon Express or 4WD Parts, I neglected to mention that earlier.