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pinnion angle shims?

I have a 1994 xj with a np231 t-case, chysler 8 1\4 rear axle, rusty's 6 " leafs. and 33" 12.50 bfg AT's. I have gone through 2 u-joints in the past 5 months. I know I need a SYE, but also I'm sure I need shim's to change the angle of my pinnion. Right now there are no shims on. How do I find what degree of shim I need?
 
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