If the pinon angle is off will this cause the car to vibrate at high speeds. Also how do you check the angle if the motor and tranny are in an auto that did not come with a slant six. It has no vibration until I pass the 1/8th mile but vibrates before the 1/4 finish. ???? Have installed new slicks and balanced them but have not been down the 1/4 yet only 1/8.

That will do it. I have some of that to deal with myself. Having the shaft too straight can make vibes as well.

Are you guys towing out to MATS?

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Way to expensive. That would shoot my whole budget for /6 racing this year.

My friends in Washington who race a big honkin' wagon like me have been experimenting with different pinion angles. The best set-up to date is 7* down, mind you this is with a bigger car and a big block. Their 60's improved dramatically and of course slightly better e.t.s. This would be horrible for a street/strip car and would burn up u-joints like crazy.

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4 to 6 degrees for a leaf spring suspension.. less power and weight, use less pinion angle... more power more weight use more pinion...

a good average is 5 degrees...


on a 4 link, or ladder bar setup i set the pinion at 3 degrees.. with shocks rotated at the same angle..


you getting a high speed shimmy could be a variety of things, i would check from the tailshaft back if i were you.. i've seen transmission yokes cause it, ive seen coilovers be the curplit too..

We had an unbalanced drive shaft cause our tail shaft housing to sheer offat the end of the quarter one time. Big ol' mess but the car kept running back to the pits.

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Looked in my, published in the mid 80s, DirectConnection chassis manual. It recommends 5 to 7 degrees nose down . It also emphasizes that the 5 to 7 degrees down recommended is in relationship to the driveline angle and not in relationship to the ground plane and gives a detailed explanation with diagrams.
Is this a drag racing only recommendation or can it be considered for all chassis setups (spirited street driving with lots of corners)?