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Re: Checking Driveling Vibration & Calculating It.
Looking down at frame rails, center line of trans and center line of pinion should be in line with truck frame rails. Angles auto-magically cancel. More offset of one to the other doesn't matter. If axle is set back to make big thrust angle, or trans and engine are not parallel to rails, then you might see a problem.
WRT to vertical plane, pinion angle is not parallel to ground, trans angle not parallel to ground, shaft must be installed so angles cancel.
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