Had my driveshaft rebuilt today...
I've been battling a driveshaft vibration since we bought our '05 F350 about 9,000 miles ago.
The vibration started out only noticeable around 65-80mph; You could feel it slightly and it made a droning sound.
I originally thought it might need u-joints; I pulled the shaft (2pc; 3 ujoints and a carrier bearing) and replaced all 3 ujoints with the Brute Force ones from my local auto parts place. I did not that ALL 3 original Spicer Ujoints were in fine shape and didn't show any signs of wear after 142,000 miles.
After reinstalling everything the vibration was HORRIBLE! At 45-50mph, it was BAD, and 60+ was worse than before...
I called a driveshaft shop and got some pricing to rebalance my driveline. In talking to the owner, he asked which U-joints I installed; After I told him which ones he immediately described them (colors) and said they were garbage. He made it clear that he didn't say that because he was trying to sell me anything, but because the seals inside of them leaked badly and the life expectancy out of them was SHORT. His advice to cure the vibration was to put the stock Ujoints back in and balance the shaft.
I dropped the shaft off last night and he called me today when I got around to working on it. In addition to new ujoints and a balance, he recommended replacing the rear shaft section to get rid of the clunky weight/balance ring on the pinion end. He mentioned he'd seen a few of them break free on the shaft!
So; After picking the driveshaft back up today, I've got all 3 new Spicer ujoints, a new rear shaft section, and fresh balance of both the front and rear sections (of the rear driveshaft). The vibration is virtually gone - I still notice a tiny bit at around 65-70mph, but it is so minute that it may very well be something else.
Just thought I'd share; apparently the stock driveshaft leaves something to be desired.
FYI - The shop that did the repairs was Ferguson Driveshaft in Morristown, TN. This is the 2nd time I've dealt with them and they are great. The shop is a bit out of the way, but if you're in the Knoxville, TN (or anywhere in East TN for that matter), I strongly recommend them!