Driveshaft vibration

[Jgth2001]

I have a 2001 Silverado that I just changed my carrier bearing and all three u joints on and now starting at 35 mph I get a vibration. I rotated the u joint at the diff and tried again and still vibrating. I then loosened the carrier bearing and made sure it was in forward in the bracket even and then retightened it again with no joy. I read it could be wheel bearings but that is not the way it feels. I also got it up to 65 then put it in neutral and glided to around 30 and the vibration gradually calmed but not fully. I think maybe a needle bearing got bent or something. Either way what ideas do you have?

[Duelin]

What brand of u joints did you install? I have seen vibration problems after cheap Chinese u-joints were installed. I only use Spicer u joints unless they are not available.

[00Silverado4x4]

I'd double check the driveshaft just to make sure it didn't throw a weight. It may be the driveshaft is out of balance.

[Gurrzt]

Or the drive pinion angle has changed.