Pinion Angle?

[EricW]

Anyone know the pinion angle of an 8-3/4 rear? I thought it was 3*.
Thanks,
Eric

 

[djwhog]

Here is alink to shims to mod the angles. I was told 1-3 is correct for a street car.

http://www.shopwiki.com/Pinion+Shim+Kit+-+3+Degree

Ray Currie of Currie Enterprises, which specializes in rearends and rear suspension systems for race, street, and off-road applications, agrees that pinion angle is a pretty simple (there’s that word again) concept. He explains that a universal joint is designed to handle between 1 and 3 degrees of pinion angle. This is a safe operating range for the U-joint. If the U-joint is forced beyond its normal range, it can hyperextend and lead to catastrophic failure. Currie always strives for 2 degrees of pinion angle on a street car regardless of the type of rear suspension being used.

http://www.carcraft.com/howto/91758/index.html

 

[Supershafts]

U-joint angle has everything to do with the rpm environment it will operate in.

In the performance world you would want 0 degrees under load...which would depend on your suspension in which to set it, maybe 4, maybe 3 maybe 2...
Most leaf suspensions can see 3 degrees, most links may see 1 or 1.5