Thread: pinion angle?

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i just dropped a 12 bolt posi rear end from a 67 camaro into my 70 nova as well as some comp engineering j bolt traction bars. She is hookin alot better but my question is do i have to adjust pinion angle even thought the parts are basically bolt on with no conversions of any kind? I do experience some vibration when shifting to 2nd. Could it be the pinion angle or maybe the preload on the traction bars?

Preload?? Whoa!!! There isn't supposed to be any preload. There should be 1/4" to 1/2" of daylight between the top of the snubber and the bottom of the spring eye.

If I wanted to know what was going on under there, I'd mount a good strong light and a video camera under the car and do a couple of good, hard passes. You'll be able to see the pinion angle under power and determine what's goin' on.

CE makes 2 degree angle plates if you find you need to rotate the pinion to a more acceptable angle. The plates will also work to give you the daylight you need at the snubber or for more snubber clearance, you can perform surgery on it with a hacksaw blade.

It sounds like you are more into drag racing then normal street driving. If that is the case pinion angle should br one to one and one half degree.
I have seen slapper bars adjusted with zero to two inches and they all worked ok on the car they were installed on. It depends on the car and tire combo.
try to remember that the adjustments are made for reaction times at the track. More clearence less reaction time---less clearence the quicker the reaction time.
If you drive mostley on the street you need some clearence to maintain a good ride and not bind the supension.
I hope this helps.

Thanks! When I installed the traction bars, there was no clearance but I just installed two 2 degree wedge plates and that gave me about a 1/4 " clearance on both sides. Im gonna see how that works and maybe add another 2 degrees if necessary. As for the vibration i experience into 2nd gear, im thinkin it might be a tranny mount bolt or loose bracket but i still gotta check that out.