Nice duster. I got a 68 b body rear and I wanted to slam some bullit wheels under it 18x9 and 18x10 in the rear. I was wondering if I had to move my springs in under the frame rails for that.
You don’t need to relocate the springs the full 3” to put them in the frame rails and do the mini tub for 18x10’s.
But you should get a 1/2” spring hanger/shackle offset and move the perches to 42” c-c.
I’ve got 18x9’s and 18x10’s on my Duster with a 68-70 b body rear with 275/35/18’s up front and 295/35/18’s our back. But I also have the 1/2” spring offset and I trimmed about a 1/2” off of the quarter lip to do it.