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#38767 03/22/2004 3:23 AM | Joined: Oct 2003 Posts: 13 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2003 Posts: 13 | what pinion angle should i use on my 1940 chevy truck? i am using stock rear leaf springs,with a 12 bolt rear,running 502 bbc.thanks | | |
#38768 03/22/2004 3:42 AM | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | Under normal loaded conditions , the 'U' joint works best at minimum angle . So set the pinion to be parrallel with the g/box output shaft , under load. This may equate to 3 deg down from parallel to the g/box shaft under no load. The 502 BB will generate plenty of torque to twist the springs up a little  . | | |
#38769 03/22/2004 2:45 PM | Joined: Aug 2001 Posts: 139 Member | | Member Joined: Aug 2001 Posts: 139 | Tommy, the pinion shaft angle and the transmission shaft angle should be the same but, not on the same plane. The u-joints need a slight off set to work properly, 3 degrees I think. The key is the same angle on both ends.
Someone directed me to randysringgrearandpinion.com when I was debating ratios. Great site for you kind of questions. Mike | | |
#38770 03/22/2004 6:52 PM | Joined: Aug 2003 Posts: 264 Member | | Member Joined: Aug 2003 Posts: 264 | The angle between the trans output shaft and driveshaft should be the same as the angle between the pinion shaft and driveshaft. Max 3 degrees there for reliable vibration free operation. Should have a minimum of 1/2 degree which allows the needle bearings to rotate. Zero degrees, zero needle rotation. | | |
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