4500 stall in mine felt almost stock to me. The biggest thing is to get a good QUALITY converter.
For just drag racing and some street use a TH400 will be fine, but if you plan on highway driving, I would really look into the 4L80.
I'll sell the TH400 in my car, 1400obo
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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