What size tires? If you have 22's that'd be fine but if you have 25's+ I wouldn't do it if you trail ride alot. I have 26" 589's with a 21 and it will do 45mph but thats about it. I wouldnt regear becasue of loss of low end. Im about perfect where Im at. Why in the hell do you need to go 50+mph on a golf cart?