New Vibration!!

[LB7Diesel]

I Just started noticing a vibration in the truck. If i'm at a stop light and just ease up on the brake pedal and let the truck roll foward it get's a vibration that feels like it's coming from the tc or trans. It doesn't do this when stopped and also goes away as soon as i touch the go pedal. I also don't get the vibration unti the trans get's to operating temp. Any ideas?

Thanks.

 

[Mike L.]

Possible u joint going bad.

 

[LB7Diesel]

The vibration seems to be to fast for that Mike. I mean i can't see the drive shaft making that many revolutions. This only happens at a crawl. It's very weird. Could it be the tc? Or would a tc/tranny problem have other issues associated with this?