Stock Jeep TJ rear coils will drop the rear about 4" and make it a 1/8 ton pickup with the ***ociated smooth ride.
I found some rear springs for my Brothers 64 on Ebay and he paid around 80 dollars for the 5 inch drop. His front coils were already cut so all he wanted to do was lower the back more. There's plenty of places that sell the lowered springs. Just search the net, that's what I do all the time.
Not sure if that would work because the rear coils are "pig tailed" at the end for the cup and bolt that holds the coil in place.
Stick in a newer cross-member with power brakes, steering and sway bar. Drop spindles as well as springs are readily available.
-2" front and -3" rear springs from CPP got my 64 down pretty low, but now it sits on the bump stops if I put my Harley in the bed. Rides nice, though.
Probably the most readily avalible vehicle for lowering parts; truck magazines are stuffed with ads for them. Do yourself a favor and use dropped spindles.
Spindles with discs and drop springs front or rear are the "right" way to go for sure. BUT...if you are working on a low-budget you can cut 1-1.5 coils from the front(start with 1) and the TJ springs can be had for FREE as take-outs from 4x4 shops. And, the stock rears can be re-installed easily for heavy-hauling. Works for me.
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