[burgoyne]

I wouldn't run 37's on a stock TJ 44 at all. You could probably get away with 35's (but will be fixing things as they break).

I have the rear 44, and I am running 33's. I may go up to 35's, but I'm going to be doing upgrades to it first.

 

[Bfmine]

I ran 36's on my rubi 44s. Destroyed the gears in the rear locker. Changed to an ox locker and destroyed shafts. Upgraded to a 60 rear. Still have the rubi front 44 It has alloyusa shafts and I run 39s but I have to be conservative or it'll eat shafts. So you can get away with it....... But you're playing with fire