nate, if you can't replace U-joints then you have to turn in your man card . . . along with your tools. It's slightly more difficult than picking your nose.

On being out 180 . . . that would have zero effect on balance. It would only matter if it was balanced (long ago) along with the yokes it is bolted to. I doubt the factory balances them in the truck. Not sure how they'd do that. It's like saying you always have to put your tires back on with the lug bolts in the same rim holes.

And you can press them out yourself if you have a vise. The first time I did U-joints on an ole Datsun pickup, I had nothing but some hand tools and a hammer, pounded them out on the curb, and didn't worry about being out 180. Turned out great.