I'm doing the same thing......had my driveshaft re-tubed, balanced, and both u joints replaced (Spicer part # U5-799, 1350 series) today......new u joint straps/bolts and pinion yoke ordered and due to arrive shortly.
It was amazing once I had the driveshaft out of the truck and in clear light at the shop to be able to see how dinged the driveshaft was in several places, and yes with a slight bend to it.......forklift gremlins?
Of course it was no wonder that I had a horrible vibration at 40-45 mph. Now that I have a "new" driveshaft freshly painted, almost hate to put it back under the truck it looks so good.
Now if I can just get my replacement TH400/NP208 adapter to arrive, I can proceed to address the transmission fluid leak.....what a deal!
new
I just had a driveshaft rebuilt this week for Terminus M1009. That was both U joints balanced and all $169.70. That sort of takes the guess work out of it. I heard the squeaking Saturday at RC and was surprised to find both U joints bad. The yoke I replaced with a Yukon yoke from Autozone. I marked the nut and pinion. I removed the nut with a breaker bar and counted the revolutions that I turned it to remove it , replaced the seal and yoke and tightened the nut back up to the same point again. Checked it with the breaker bar and it was tight. Good enough. If you go crazy with the impact I am sure you could do damage. But just use common sense and you will be good. If I am wrong. Sorry It worked for me many times. And I learned it from old timers. Have a Great DAY.