i HAD the cRustys 4.5" lift kit with full springs. i have had quite a few issues with it- broke the trackbar 3 times, rear brake line extention was crap, rear shims broke and gave axlewrap, rear spring eye would hit shackle box when flexing and has caused damage to the rear crossmember, shocks were crap, the bushings on the LCAs wore out quite quickly and the leaf spring bushings are shot.
slowly i have been swapping out the kRustys krap. the coils and leaves are the only things left from him. my lift is now his springs, coil spacers, uknown brand lift shackles, TnT Y-link, RK trackbar. im much more happy with this set up now