The number the engineer quoted me was stated in rwhp, because I asked that way, as I didn't think I'd ever have access to an engine dyno. He said it was very likely good for 400ftlbs at the flywheel, a very stout box.

I've always been suspicious of hp losses in the tranny. 40hp loss is over 100,000btu/h, and I'd think the tranny would be a puddle of aluminum after much of that, as tranny fluid cooling is quite small in capacity. I think using the big loss numbers is a way to brag about flywheel hp, sort of like using brake hp instead of sae net hp, but I'm a suspicious old fart...

In any case, the strain on the tranny is in the higher gears when the engine is pulling against the largest resistance, and my a/t locked up the TC above 42mph even in 3rd, so the losses should be less.

What gear did you use for the pulls? I would guess the largest losses are in 1st with all the gear monkey motion...