Just don't really see any reason to get all fussy about matching the angles... Too many launches with a 0 degree tranny and 3 degree down pinion, and that's with slicks and big horsepower. Seems if it's a good driveshaft and joints it will work just fine within about 5 degrees or less.

I know all the "science" and "theory" behind it, and even understand what all the engineer's are talking about. Just haven't seen a lot of problems in application. Our
Comet drag car, for example. The engine sits level at launch, which leaves the trans angle a couple degrees down...The pinion angle is set a 3 degrees down. The car was built 10 years ago, gets about 100 passes a summer, new U-joints every winter, and has never had a failure or a vibration in the driveshaft...Everyone will tell you those angles are all wrong, but it works just fine!!! Look at some of the oddball angles on 4 wheel drive stuff, and they survive...

Maybe all the angles is more important on light duty parts, but I sure haven't seen any problematic failures with angles being not exactly right when quality parts are used... Heck, our old Late Model had 9" of travel on the rear suspension, think how "incorrect" those angles got, and again never a failure???

Maybe I'm just lucky?