Originally Posted by housedad

Mine is pretty bad too, front and rear. I was planning on total replacement, but thanks guys for the idea of re-tubing them. That might save me a bit of money too. I already have new u-joints to go in there so if I stick the ends into some Rust-Ex and then take them in, retube them and paint them, that might be a cheaper alternative.

As far as buying one, you can find them rebuilt and new in various places on the net. Prices vary.

Tasca ford carries the them new OEM
A1 Cardone makes reman units front and rear.
If you want a really good shaft and are a bit nuts about the truck, check out Tom Woods driveshafts. Tom Woods Driveshafts Excursion