The angle of your engine/transmission in relation to the ground determines your pinion angle. In other words, the angle of your front U-joint
MUST be the same as the rear U-joint. Try to aim for between 1 and 3 degrees. This is difficult to do in a lifted vehicle because the engine was placed at a certain angle from the factory for a stock ride height. Obviously you can't change that angle without major modifications, so you may have to live with a larger angle than recommended.
