My power steering whines like a mother when im offroad. I'm running 37s and an old pump from an old chevy car. Im hoping its just a bad pump, what do you guys think???

Most likely a bad pump if you are full of fluid. I went through a few different Saginaw pumps and the AGR pump I ended up with has been really good.

Big tires & or a locker in the front will put extra strain on the system. A bunch of us are running P/S coolers. I would recommend running one. Also, ARG is the way to go.