Its no wonder so many get confused about pinion angle when you read some of the article's about it. Some talk about the driveshaft angle and has many thinking the pinion should be 2 less then the driveshaft angle. The one article posted says to leave the trans and pinion the same as he states that where he prefers street cars to be. But really as Dr Diff says its very simple. Dont worry about the driveshaft angle just check the eng,trans angle which you could measure at the trans output shaft yoke and then measure the pinion angle which can be checked at the pinion yoke. Just make sure you are on the yokes and not the driveshaft. So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron