i did that same swap, mine werent TIGHT but they weren loose either. if i rember right the backing plate is just a dust shield, so slip fit will be fine. the caliper bracket is the important one. i have an aussie in the rear of my zj and like it. rarely chirps when i turn real tight, but its a noticable clicking when turning, no biggie to me. I'm sure you know this but make sure you have a open diff, it won't fit in the limited slip carrier