Parallel points for measuring pinion angle...

I remember I ran a string from the center of the tailshaft of the trans to the center of the rearend to aid me in more accurate pinion angle.
Dan

 

My street car WILL vibrate severely at 6 degrees down. I like you have played with many settings on my car, So this i know for sure. A four bar car is a horse of a different color, which should not be mentioned in the same book as a leaf spring car. I to set up four bar cars (mustang in specific) Which like i said is a horse of a different color. I wont argue the fact that it may or may not change your car, But a small radial tired Mustang it will. 1 degree can and will make the difference between traction and no traction. on a side note a Big Tired car doesn't have to worry as much about pinion angle as a small tired street car.