Kyle's recommendation of -3* is not the working angle. The working should always as close to zero as possible without actually being zero.
All measurements need to be accurate. You need to remove the drivesahft and measure at the tailshaft of the trans and across the pinion face where the ujoints mate up. Also measure the tube itself to determine the working angle. Get all those measurements and I'll put together a small jpeg depicting what you have and why the angles are what they are. It always helps to "see" what you are trying to understand.
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Dennis
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