Originally Posted by user151
What Cobalt said may be correct "under acceleration" but considering you have a 4 link and sound like you are not a racer or dragger, I would set the rear pinion up the same as the trans is down... 5 degrees.
The ONLY time you want a negative pinion angle is if its a strip car. A four link wouldn't need negative anyway as the pinion angle won't appreciably change during acceleration like it does with leaf springs. For street driving you want to match the trans angle in reverse. Trans 5* down - pinion 4-5* up.
The most important things you learn are those things you learn AFTER you know it all. -- Chip Foose