I would grab the whole Trans Am rear, as said disc that can be converted. Also it will have desirable gears and probably the good Torsen posi. Add GN 8.5" or Moser axles and you have an upgraded rear end. I personally would not want an LS car with shitty gearing.
I give it a week, no one a abuses performance cars. Go on Real Olds Power, all you have to do is make one anti right wing comment and then they argue how great the 4L60E is. They failed a lot in trucks, there is a great price GM reman to cover certain year failures and GM noted it in a TSB and why it is offered. It failed in my BIL's 95 Z28, can you tell I am a fan? My 94 Z71 had a GM reman that developed the weak reverse issue. I blew the 3/4 clutch pack in a 4L65E towing a light load. I've blown up enough 2004R's as well but like the gear ratios much better.
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