[JackedRamcharger]

Well the other day I replaced my U joints and still had a bad vibration so today I checked the driveline to make sure that the joints were lined up they wernt so I fixed that and still has a low speed vibration..any one got an idea??it goes away at about 40 MPH or so

 

[Smokey]

Toe-in on the front wheels/tires ?

 

[JackedRamcharger]

no I can feel it right below me..Im kinda thinking maybe the driveline is out of balance

 

[Smokey]

You'd be really surprised how vibrations (and noises for that matter) can telegraph around and make panels elswhere resonate.