It seems that the higher axle gear (lower number) makes more power on the dyno.

2k13jk making more than black betty using the factors of larger tires, 32 vs 35, and higher gearing 3.21 vs 4.10 makes the hp numbers climb.... Or so the prodigy thread says.

That seemed to be the reason that Jesse's Girl with a turbo and 4.88s made less power than expected.

SOOOOO many variables with these dynos.