Nv 4500 input shaft
 

Anyone know who makes a good one to upgrade to or how much power the stock one can handle before it breaks?

I want to say NADP/NAPC supplies a 'better then stock' input shaft, and I know a HX35 over S300 with 191 DV's and 75hp injectors with pump tuning has pretzeled 2 inputs at a 1750 RPM roll on the throttle in 4th... If that means anything to ya, lol.

Im running everything in my sig and i just ordered a s475 to use in compounds

Sorry, wrong emoticon...

I'd say you should be looking for an upgrade if you plan on putting power to the ground in tires any bigger then stock. He dropped his lift down and went from 37's to 33's to try and make it hold together.

Im running 20's with 305-50-20's