Ajram, im prety sure that a z28 rear is a little longer and wont bolt right up. but i have a few concerns about your post, you said that your rear end is a limited slip, that means that it IS a posi unit. so why would you want to switch it? your 10 bolt 8.5 carrier is an extremely strong rear end, very under rated. dont listen to people that tell you that you need a over rated, overly heavy Dana or Ford 9 inch! your 10 bolt will handle ALOT of horse power, i have a 10 bolt 8.5 rear in my 500 horse power 500+ foot pounds of torque skylark with stock axles, the only thing i upgraded was the posi unit and gears (since i changed out graes anyway).