[Ironangel]

When I swapped axles in my 72 I located the perches one at a time, letting the existing perch hold the axle angle while the the u-bolt located the new perch. I then tack welded the new perch and let it locate the opposite new perch. I dropped the rear 4" using springs only and have had excellent results with no vibration at all. I did this on a LWB truck and simply used a bent panhard bar to center the axle. I race and show this truck as well as drive it locally. After much research I retained the two piece drive line as they are more forgiving especially when big block torque and horsepower are being used to turn a 12-bolt 4:56 posi with 15 X 30" Sportsman Pro's. Your set up should work well as long as that one piece drive shaft is balanced and balanced for highway speeds. That entails a thick wall DOM tube of at least 3" diameter. As long as the pinion angle is within 3 degrees of the tranny output shaft you should be good. The trailing arm suspension (pinion angle) doesn't change hardly at all under torque but will change with load and as the suspension travels...Here's a video of mine heating the hides up, watch the rear end... https://youtu.be/_jXxaOqm36M?t=1m16s