Definitely run toyota mini truck axle. They are great. Very reliable once you beef them up. I never broke anything in my front axle and i run a detroit up front as well. And we wheel the hammers, rubicon anywere in the southwest, with no problems. Anything over a 37inch tire i would step up to a 60 but with 37's your good. Also would recommend highsteer, longfields and longfield hub gears as well. Its a proven combination that works pretty much better than a stock 60. Also the narrower toyota axle seems to get through some tight spots a little easier