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Old 04-03-2009, 12:17 PM
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pinion angle

Im getting ready to install a 12 bolt rearend from a 70 chevelle in place of my 10 bolt in my trans am. My question is that in order to do this i have to change the perches from coil to leaf which i can do myself no problem but a couple years ago i read an article about when you do this you should change the pinion angle when installing the perches. I dont remember to what though. So if anyone knows for sure if this is true and what that angle would be would be great.
Shoud i put the perches in there stock angle or should I change it. The car is street strip with 700+ horse. Hooking up will be a problem no matter what but why I'm there if there is a way to mount these to help this problem then great. Im sure that adjustable traction bars will help to. Have a caltracs set now. Thanks
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Old 04-03-2009, 12:25 PM
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You'll want a couple degrees pinion down, not more than 4 degrees, IMO.

This is what was done with my '81 Camaro when I went to a 12-bolt from the stock 10-bolt.

Hooked up good, no axle hop or spring wind-up when using WS6 leaf springs from a '78 T/A.
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