Originally posted by bracketeer
pinion angle should be pointed down 2 to 5 deg depending on horsepower. when you launch the car the pinion should come up in direct line with the drive shaft.
i have read several articles saying both pinion angles should be the same. i am not going to argue the point. all the drag racers i know all set the rear angle and don't worry about the front one. your choice.
This is true for a "RACE" car but for the street the angles should be the same. If not you'll be wearing out "U" joints on a regular basis, not to mention other problems caused by the vibrations given off by the misalignment.
For street use the angles should be parallel. If the trans angle is 3* down the pinion angle should be 3* up as in this drawing from the Inland Empire Driveline web site.