Adjustable control arms are helpful in adjusting pinion angle. I have the same lift and my experience was with my stock axle I didn't need new control arms. When I installed my SYE and 8.8 I did need them because I was getting vibrations due to an incorrect pinion angle. If you plan on upgrading your axle in the future it may be worth installing the control arms first that way you are prepared for when you get the axle. Stock control arms are pretty weak so if you get them now you can take advantage of the strength upgrade. FYI I got Savvy double adjustable upper and lower arms in the rear and I'm very happy with them.
I didn't need an sye until I changed to a different axle
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