Rich, you subtract the angles if they are on the same plane and add them it they are not.
Your scenario:
Add:Your rear pinion is pointing down from level 2 degrees and your drivshaft is sloping up towards the front of the car .7 degrees. They are on different planes so you add them to get - 2.7.
Subtract: Your drivline is pointing down from level 4 degrees and your driveshaft is sloping down towards the rear of the car on the same plane .7 degrees. Your working angle is -3.3.
Now you see why I mentioned raising the tail shaft of the trans. The RIGHT way to do it is to have equal and opposite numbers. You have two negative numbers but that's all you can achieve without slicing and dicing the tunnel. I'd at the very least take it out for a high speed run before you put in the carpet and dynamat if you decide to run it this way. I'd cut the tunnel.
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Todd
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