Your D44's should be fine, maybe go cromo axles when possible. I'm assuming you have a 4.0, if that's correct your 3.73's will not be ideal, but definitely okay for turning 35's, if you have a 4 banger you'll need to regear. Rear disc's would be great, but the stock brakes are doable. I ran with stock brakes while I was building my 8.8 and they stopped the 35's okay. Besides making sure you have room, steering is one area you'll need to address at some point. I'm running a RuffStuff 1 ton Y link steering, it's s big improvement.