13" has the least slip and mush. Stock 60-70s Big Car thru GTO, tight as you know.
For some reason the 4L80 stocker for gasoline engines has a nice stall but plays tight on cruise, where is not worth locking it up.
12" Hughes "2500?" ought to play well. Great balance on low-slip, low mush with highway gears, nice flash on a 455.
11"-10" better seek ATI or other spendy, proven converter.
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