ever think 7 maybe to much and I didn't invent the method. it is taught by people who run a lot faster than you or I will ever run. think about the purpose of setting pinion angle. setting it off of the drive shaft ignores the front ujoint totally. ever think the springs maybe wearing out letting the pinon go more than the desired amount? remember the guess of 7* down or what ever is just a guess. no way to figure out the perfect amount except trail and error or maybe some kind of video.
Like I'd mentioned.......that was with a leaf spring car, and it does have slicks, and it does make close to 600HP, and I does launch like I stole it......and I doesn't want the driveshaft to smack the floor pan when I do........been there, done that.....
The thing you're forgetting is that a LOT of places recommend 6 to 7* pinion angle with a leaf spring car that's making some poop, and my car would not work doing it that way.............that's all I'm saying........
and I didn't invent the method. it is taught by people who run a lot faster than you or I will ever run. think about the purpose of setting pinion angle. setting it off of the drive shaft ignores the front ujoint totally. ever think the springs maybe wearing out letting the pinon go more than the desired amount? remember the guess of 7* down or what ever is just a guess. no way to figure out the perfect amount except trail and error or maybe some kind of video. 
