Re: Pinion angle
No ,you are right. The author's explanation is confusing you, that's all.
If the drive shaft runs downward from the trans, as in most cars and trucks, then the pinion has to run uphill, front to rear. That provides an opposite angle to the rear u joint.
If the angle was the other way, then the drive shaft would whip like a jump rope; That is until it exited the car.
You really just need enough negative pinion angle so that, under power you don't cross the zero point . How much movement there is, depends on the type of suspension, for one thing.
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