This post cleared up A LOT. OK I will not give up
You can make a rear that will be stronger and with the axle /wheel bolt pattern you want. BUT it will be so expensive to do you can but a complete set of NEW rims for the same price.
Really we can do it it is ONLY money.
If you have a torque arm that will be another hurdle that is AGAIN more money.
HERE IS WHAT YOU CAN DO with the stock 7.5 monza rear to make it stronger than stock and really hang in there even at the track with slicks.
custom combo with the stock H-body 7.5 rear and stock 4 lug wheels
NEW true trac posi unit (28 spline unit) 450.00 ish
NEW gears machined to fit the h-body housing (price will very in gear ratio selection 3.23 3.42 3.73 4.10 4.56 150.00-230.00
NEW moser custom c-clip axles (28 spline with 4 on 4 bolt pattern and centering hub to fit stock brakes and drums and factory wheels)300.00 pair
new bearing and seal kit 95.00
New axle bearing and seal kit 35.00 (does both axles)
There is your build. Jim
Will fit all the stock h-body brakes and housing you have.
Call me if you are series and will get the stuff build and shipped for you-
Jim
J D
330 990 8155