just curious what the best angle for the driveshaft into the diff? a picture would be saweet. i have a reg cab short bed. its lowered so ive altered it im sure. here's mine

 

Well, measure it and tell us what yours is.
Normally if you lower it, you will need to shim the pinion nose down a little.
If you don't have any vibrations, then I wouldn't worry about it.
You tranny yoke angle and pinion angle should be within 1/2-1* of each other. Parallel lines that do not intersect each other that are equal but opposite.
Your U-joint angles should be no more than 3* and no less than 1*.
Remember, under hard acceleration your pinion nose will want to twist upwards. So you would actually want the pinion angle pointed a little further down than the tranny yoke angle. When the pinion twists up, then they will be inline.
This would be the correct way.

Jim