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Pinion angle is the relationship between the transmission centerline and the pinion centerline, not to the ground and not to the driveshaft. Ideally, you want the pinion to become parallel to the transmission when the vehicle is under power and the pinion torques upward.
Make the pinion parallel to the transmission as a baseline, then pivot the pinion downward 2 degrees for a street car. This is referred to as a 2 degreee negative pinion angle.
Will raising the transmission up 2° give the same effect?
Yes, if the pinion angle is still parallel to the transmission. No matter if the transmission is up (positive) or down (negative) set the pinion angle parallel to it, either up or down, then take away 2° down (negative). So in theory the two will be parallel to each other under power.
I had a post on this very subject a couple of weeks ago. Do a search for it.
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