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i would only use the 8.5 in something with an engine swap, i have one in my 62 back halved 455 cutlass. its way more rear end than these cars need and will need to be narrowed. a 7.5 will be plenty strong for the probably all of us running 215’s and s10 rear ends may not need to be narrowed at all which will keep cost down. i could do an 8.5 for someone but the extra cost of narrowing it will be factored in. you can by gears posi’s axles etc for the 7.5 and even in stock form will be a dramatic improvement. thanks for replying, i would like to bring a few swaps to the market to help keep us on the road as i really enjoy these cars and want others too as well. other things im hoping to bring available will be an auto swap for people who want auto’s, i have not done any testing or anything yet, and possibly headers