All I know is that if I could end up with a 9-second 4,000 truck just by swapping transmissions I'd be all over it! I think I could probably believe 4 or 5 tenths though. Even that's enough of a gain to make me really think about swapping.

From my days of herding Chevies down the track... I saw a 4 tenths difference between the Turbo 400 I was using and the Turbo 350 I swapped into it's place. Of course, neither of them have OD units. Then again, I don't really know what the difference are between them other than physical size.