I'm too lazy to look up the specific ratio's of the boxes being talked about here. But I've always found the spread of the 60L and my 63A to be quite plesant for most uses with my engine.

Interesting read Jmac.
I've not heard many good things about tri-magics. They dont sound much/any Better than the bw35's.

Given how understressed the Jatco's are, it shouldn't require a huge outlay to freshen up a used box. As I said earlier, the one I stripped last weekend was lke new in the clutches.
But from the one Auto A series car I've been for a ride in, (Albeit a bog stock a12, either four up, or drunk- or both) it did seem like there was a decent amount or power sappage.