I'd go with the overtight u-joint bolts. The distance from yoke to tailshaft actually gets longer when the car is on the ground and shorter when the axle drops out of the car. You wouldn't think by looking, but the angle of the suspension link (in this case the spring) pulls the rearend forward as it drops. Learned this the hard way installing a too long driveshaft and had to jack the rearend back up to stock position to get the shaft in. duplicating pinion angles while under the car is esy enough with a floor jack under the pinion of the diff, then you can see if the shaft is bottoming in the trans. support the car properly of course.
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