driveshaft angles

92b said

So with rear end out of the car and the spring pads level to the ground the front of the pinion is angled down 5 degrees relative to the ground?

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Yeah, because you set it up with the rear axle upside down so you can get to the perches to weld them on, so you're actually pointing the pinion 5 down. Once flipped right side up and installed, the pinion has a 5 up angle built in.