For what it’s worth, I’ve run 37s and 5.38 Yukon gears in my ‘09 JKUR automatic for the last 45,000 miles with no issues whatsoever. I originally installed 4.88s and the combination was the suck with 37s. I’m in mountainous SW Colorado at 7500 ft. I’m 3 hours from Moab and am over there on the trails probably ten trips a year. With 37s and 5.38s higheay cruising rpms are virtually identical to stock. For a 3.8L and 37s it’s a near perfect match. If you plan to stay with 35s go 5.13s. If you go 37s later they’ll still be acceptable.
'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.
Last edited by SoK66; 11-20-2018 at 09:34 PM.