I'm converting to hydro-boost in my '79 K20 4spd. How can I tell any differences in 1/2-3/4ton vs 1ton brake pedal assemblies? I have searched the forums and know that a set from a 1ton will give more piston travel ,but after pulling some from a K30 4spd I found that the truck had been converted from auto to man.So I'm not sure what they came out of. Anybody help me out so I don't have to pull my current pedals just to compare. Pics maybe?