None that I know of, other than you're limited to 30 spline axle shafts. (Btw, if you have a rear JK Tru-Loc laying around you can use it in front with custom 32 spline shafts.) With 37s the front locker shouldn't be an issue if you upgrade to chromolys or RCVs, etc. The factory lockers on JKs have been pretty reliable, not a lot of regular failures like we saw with the TJs. The advantage of going to a decked out PR44 wih ARB, RCVs, Reids, Pro Steers, etc. is you can get the thing shipped built as you want it and just stick it in there. I did the TF R44 housing on mine and it went great, just the time & hassle factor of the swap over. I already had Reids, chromolys, Spyntecs, and just figured the swap would be less expensive than going the whole route and then trying to sell the stock housing complete. I got some nice cash for the bare housing, which was sleeved & gusseted, control arm bracket skids & with Pro Steers. That pretty much covered the labor for the install which I had to farm out as I was in recovery from shoulder surgery.
Whatever, the only regret you'll have upgrading the front housing is that you didn't do it sooner, or, maybe that you didn;t just do two crates full of PR60s. Knowing what I know now I wouldn't have put a penny into upgrading the stock JK housing.
