Pinion angle described...
Thread Starter
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
Pinion angle described... I see alot of questions/misconceptions about pinion angle...here is my best understanding of how it works..
Alot of people say measure the driveshaft and set the pinion angle a few degrees down from that. This ONLY works if the pinion centerline is co-axial with the transmission output shaft. 9" fords have a lower pinion position (as exaggerated by my sketch). For the top 2 sketches I have zero pinion angle shown. the 12 bolt would show a slight negative pinion angle (as drawn) and the 9" (with its lower pinion position) would have a totally different pinion angle. but in reality they are the same pinion angle (zero degrees in this case) since the pinion is parallel with the tranny output shaft.
Correct way to measure is to measure the tranny output shaft angle (I find that using the engine oil pan on a LS1 is good since I *think* its parallel to the tranny output shaft and is very flat. Then measure the pinion angle at the yoke and have the pinion face down the number of degrees you want for pinion angle.
Hopefully this makes some sense
Alot of people say measure the driveshaft and set the pinion angle a few degrees down from that. This ONLY works if the pinion centerline is co-axial with the transmission output shaft. 9" fords have a lower pinion position (as exaggerated by my sketch). For the top 2 sketches I have zero pinion angle shown. the 12 bolt would show a slight negative pinion angle (as drawn) and the 9" (with its lower pinion position) would have a totally different pinion angle. but in reality they are the same pinion angle (zero degrees in this case) since the pinion is parallel with the tranny output shaft.
Correct way to measure is to measure the tranny output shaft angle (I find that using the engine oil pan on a LS1 is good since I *think* its parallel to the tranny output shaft and is very flat. Then measure the pinion angle at the yoke and have the pinion face down the number of degrees you want for pinion angle.
Hopefully this makes some sense
Here are a couple more links on this.
http://buickperformance.com/Pinion.htm
http://www.rosslertrans.com/Tips/Pinon.htm
Bruce
http://buickperformance.com/Pinion.htm
http://www.rosslertrans.com/Tips/Pinon.htm
Bruce
