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Old 09-08-2003, 07:30 PM
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pinion angle

I have a '55 Chevy with a SBC and a TH200-4r trans. I am concerned about pinion angle. My trans cannot be tilted up anymore to get a positive angle. I have 2.5 degrees down on pinion and about 1 degree up on the trans. Yes, there is a slight vibration, too.


Driveshaft is balanced and new. Any ideas with getting the angle higher to correct this?

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Old 09-09-2003, 01:33 PM
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I would try adding some shims between the springs and spring perches. Find ya a good trans shop or driveline shop and they should be able to help you. Basically you want the output shaft plane and the pinion shaft plane to be parallel. The shorter the shaft (steeper angles) the greater propensity to vibrate.

good luck

John
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Old 09-09-2003, 01:38 PM
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OK; but I thought the goal was NOT to have zero on both planes, but to have a cancellation of zero: +2 trans, - 2 pinion, correct?
Making the trans level is easy, I thought I needed to go higher to equal the down angle of the pinion. Whadda you think?
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Old 09-09-2003, 05:55 PM
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You are correct MADCHEVY. You are the winner of 1,000,000 dollars. Just go to the nearest bank and ask for it!

7-9 degrees would be the thereoreticle maximum if you wqant to keep joints in it. Anything less then this would be fine as long as both joints angles are the same. i.e... -7 pinion and +7 trans.

Since they are connect though, Changing the trans angle will affect the other end as well as visa versa. You will need to install shims under the leafspring mounting pads to correct.
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