oldgezzer

I need advice on hooking up a mustang 2 power rack with a chevy pump, I have changed the valve on the pressure hose with the shims, I put 3 in like I was supposed to, I drove about 50 It was to easy to steer, but I could drive it and then it starter jerking me all over the road. this happened before on another car. Don't know what to do next Thanks Oldgeezer