RE: 427 supercharged stroker results at wheels.
 

ok here is the rest of the story, after driving it for a day, every time I get into boost, a burning belt smell. after a call from campbell, those dyno specs were at 2 psi. the blower is out by 1/4 inch. problem fixed last night boost is up to 10 with no slipping. power is incredible. one day i will re dyno the chassis just to see how much I lose, as well, my 700r4 is not taking it so well anymore-in comes the 4l80....

RE: 427 supercharged stroker results at wheels.
 

That definitely would explain it. If the engine were dyno'd at 9psi and then on the chassis dyno at only 2psi, that is a significant difference.

And yeah, that would have been my next comment on the 700R4. They aren't much good beyond 450 CHP unless you dump a ton of money into them. Even the 4L80 may have some issues behind a 700CHP engine and now with 9-10psi of boost, you'll probably be up around 575 ftlbs to the wheels with methanol injection...

RE: 427 supercharged stroker results at wheels.
 

Time for a TH400 and a gear vendors overdrive kit. That would be slick.