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Old 09-23-2007, 09:40 PM
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pinion angle

I have read a lot about pinion angle and know exactly what to do to set up the angle on a car that has the engine tranny on the same centerline as the pinion.
When the articles I have read encounter an offset engine or pinion they get VERY vague as to what to do.
Lets say my engine/tranny ctr.line and pinion ctr.line are 1" offset from each other, that is,the pinion is not in the center of the rear end, but parellel with each other and at different heights with the pinion lowest.
Lets say I set up the pinion angle without taking into consideration the offset,and it turns out to be 3degs. How much more is it likely to be considering the offset?
Probably not hat much to worry about.

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Old 09-23-2007, 10:34 PM
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The sideways offset has no effect as long as the shafts are parallel and the U-joint operating angle does not exceed the reccommended angle for your maximum operating speed.
The U-joint operating angle is the actual combined angle where the shaft centerlines converge.

Typically that is about 4*-5 degrees max for a 4000 rpm driveshaft. You can probably run more if you need to, but you may get vibration and premature U joint failure.

Here is a link to a site with a spiffy angle/rpm chart and a bunch of other driveshaft info.
http://www.drivetrain.com/driveline_angle_problem.html

Later, mikey
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Old 09-24-2007, 01:11 PM
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You can also get good info here:
http://www2.dana.com/pdf/J3311-1-HVTSS.PDF

it addresses exactly what you are talking about.

Steve
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