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Also, Big Squeeze, beautiful car


THANKS.......


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Wayne,

7 degrees is too much negative pinion angle. If you are going to quote me, please post where I told you to run that much.




I never said that you said to run that much, I only said that I did it that way and it didn't work that way with me using 7* on my leaf spring car......Yeah, obviously it was too much when doing it your way, or it wouldn't have howled like crazy ........What I am saying is that I've run that much for 15 years, doing it my way, in all kinds of cars and have NEVER had an issue with vibration..........


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This isn't rocket science. Depending on the ride height and drivetrain angle of the car, setting pinion angle off the driveshaft is purely hit or miss.


I AGREE.......and my theory is that as long as the pinion angle doesn't go over zero with the driveshaft and it's not low enough to howl, it's fine in a drag car and WON'T COST ANY ET or "rob horsepower", or even a street car, so it's always been a "hit" and not a "miss" with me........


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For example, assume your race car's pinion angle is set perfectly and the car has no vibration.



The problem with saying "perfect" is that there's a pretty large window where the thing won't vibrate and it would be called "perfect"......

From doing what I'd done, it's obvious to me that if I had a jacked up 4 wheel drive truck and the output shaft and pinion were parralel to each other......and the driveshaft were pointed down at a 45* angle, and I then rotated the pinion down 2, 4, or 6* or whatever, it would REALLY howl........

The point is that the way you guys do it works fine if the output shaft and driveshaft are relatively parralel to each other.......

When I'd set my pinion angle the way that the Moparts chart shows , I had 11 degrees negative pinion angle to the driveshaft.......but it was only 7* down from the output shaft, which is what that chart shows..........and man, did it howl like crazy......

So, my point with that is, let's say we have an extreme example.........and our race car with a 4 link was set up similar to my car in that the engine were facing downhill.......and the pinion angle to driveshaft angle ended up being 11* different just like my car, even though the pinion was only down 4 degrees from the outputshaft, I guarantee that it would howl like crazy.........