The dana 30 is a tough lil' booger stock, so I wouldn't do anything with it. The 35 I wouldn't spend money on b/c it isn't worth it. Run it till it breaks then replace it. Or if you're worried about getting home from the trail replace it first. My .02


97tj, Shaved Ford 9 rear, 4:10's, New 35x12.5 BFG KM2's to test!, Warn x8000i, ARB's, Quick Disco's, Hand Throttle, & it's my DD. smile