beebs Went in blind on my 51 6400 pick-up got apair of springs from speedy Bill in nebraska,5x13, built perches cut wheelbase to 98 inches. Drove fine but bottomed out to easily,went back to speedy Bill got5x15 springs,fixed it !! Now run the wheels off of it daily,mostly suffers from chuck holes in the factory front suspension,considering shock absorbers up there to help it,rear shocks are just over the counter Monroes !