[Smurfy]

Im not sure 50MPH offroad is very practical.
High 30's feels fast, 40+ is insanely fast and uncontrollable on anythign other than a smooth surface.

If this is a one time thing 50 would be doable, if however its for a race maxx its so much more speed than is actually helpfull, id doubt most buggys would ever hit 50 down the straights.

Still sounds like a nice project, definatly get yourself a light tire setup and try and get a setup where you can drop 4 shocks.

teh stock drivechain isnt 2 bad as logn as you dont put huge shock loads.
I belive promod infact had his fastest run of 70+MPH on a stock drivechain which is very impressive.

If you could shim the diffs that would extend there life signifficantly