Under really HARD acceleration the pinion may climb 2* on a leaf spring car... Thus my UP 1* to start - and under acceleration when it climbs it will be up a little more. It's okay to have 1 to 2* of "difference" between the angle of the trans and the pinion.... these change under various conditions to begin with!
In an effort to be on parallel plane -- if the trans is down then the pinion must be up... Extend a line from the back of the trans to the rear end -- and then do the same forward with the pinion.... You can't have the trans DOWN and the Rear end down and end up parallel.
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