Re: spring over on \'77 J20
no, u cant flip the perches. once perch is cast into the diff housing.
u have to measure the dodge and compare with the rear unit on the FSJ.
tri county has a spring over steering setup for u.
the rear is already spring over.
buy a store bought lift. make nu springs.
the rear diff on a j20 is a d60 anyway...
see my attachment