As to the OP, 37's and 4" lift seems perfect for crawling I've done. Since regear to 4.88's I haven't been to Moab but live 25 minutes from 'Little Moab' and go fairly frequently. Love the regear and for me the difference is easily noticeable. Before going to 6" I'll cut out the fenders, actually in a couple weeks I'll be cutting. So for ROCKCRAWLING: remove swaybars front and rear, 37's, and 4" lift=lower COG, possibly a regear depending on your opinion. I love crawling in the 80 
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99 UZJ100, OME 2" lift, 315's, ARB front bar
95 FZJ80, lockers, off-road monster, 37" Pitbull Rockers
84 FJ60, stock
76 FJ40, v8 conversion, discs all around, lock-right in back, 35's
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