I got a bone stock 60? rear in my 71 GMC truck, to get the "duallie" wheels to fit in my pick up bed I had to move the fender wells in 3in. on either side and strech the wheel houses. But other then that they've been on for over 10 years no prob.Clears the springs fine, onlt problem is when I put 3yards of mulch in the bed the old springs tend to sag and the outter wheels tend to "rub" on the upper fender,I have used this truck for a"truck" hauling and pulling what ever I needed lol, I even went to 1-ton rotors on the front from a 71 C-30 all I did was put the rotor on and that was it, they have been on there for 2 years now and no problems.