Changing rear end angle.

[wayno]

So all the pieces are ready to go - engine in - transmission in - drive shaft bolted up - now trying to everything lined up - so from my reading I see that the tail of the transmission should be between 5 and 6 degrees and the pumpkin in the rear 5 to 6 degrees up - so can I just in between where the two meet in the rear to get the front of the pumpkin to turn down into the acceptable range and if so - should I put a couple of thick washers in between to act as a shim - how much variation can I really get this method... a half of a degree? Any thoughts greatly appreciated....