i have an 86- fixed the sag by replacing the shackles with a bigger set to even it out- not lift it but they were about 3" bigger than stock. I run 32x 11.5x 15 bfg mud terrains with no lift and they dont rub. anything bigger and you really should re-gear. with the 32's i rarely can get into 5th and sometimes have to d-shift to 3rd when climbing steep hills on the hiway....