more pinion angle fun

[Ummgawa]

I am abou to weld my 4 link brackets to my rear end housing,and this is VERY helpful and timely for me. Thanks a bunch.

[rockdogz]

Ok, my tailshaft is 1.5 down, axle is 1.8 down, and driveshaft is 2.8 down. Is this ok? Where does the -3 degrees come in?

[sinned]

Originally Posted by rockdogz

Ok, my tailshaft is 1.5 down, axle is 1.8 down, and driveshaft is 2.8 down. Is this ok? Where does the -3 degrees come in?

The way it sits right now you have a front working angle of 1.3* and a rear working angle of 1.0*. The working angles are not that bad, if you could drop the tailshaft down .5* the front would be perfect. The rear needs some work, you need to get the pinion angle up to 2*. If you can do that you won't have any driveline related issues to worry about. Good luck.

Keep in mind that it is easy to make blanket recommendations, however every car is different and what works well in one will not work as well in another. The main reason for recommending a low pinion angle is for traction at launch, as the pinion climbs it will go positive if you start at over 0 anyways. I would rather sascrafice some launch traction for high speed smoothness. Driveline critical speed drops substantialy with high ujoint working angles. Losing a prop shaft at 100+ would really suck bad.