ok i have a 1989 voyager with the 2.5 no turbo with a 3 gear auto tranny witch i just got rebuilt and a new driver side drive shaft and a driver side ball joint witch i put in now as soon as the van hits 80km/h it viabrates and as soon as it goes over 80km/s it goes away and it is starting to drive me nut does anyone might now the problem it would be very helpful thanks.

I would say you need your wheels reballenced.

i already did that a week ago

I'd say you have a problem with one of the axle shafts probably the one you did not replace. They tend to give a vibration up to a certain speed, around 80kph and then will smooth out.