Vibration/Shaking

[tilevan]

I just got a 1997 Astro Van and when driving at 50-65 I feel a shaking that seems to come from the rear. When I let off the gas the noise goes away.

However the noise comes back and I repeat taking my foot off the gas. On a scale to from 1-10 in violence of shaking it is about a 3-5

Could this be the rear end or u-joint or perhaps just low diff fluid.

[evil_motors]

sounds like the driveshaft either has a dent in it or threw a weight.

[ghostrider1061]

i would check the diff. fluid while i was under there(van in nut. with e-brake set) i would see if the u-joint(s) are bad and check to see if the pinon nut is tight. then check the d'shaft to see if there is any marks where you could have hrown a weight. get rid of the most obvious first. then if these things check out ok then i would check the brake drums and wheel balance. if they check out ok then you will need to dive into the diff itself. this should take about a six-pack in time to do.

[Matrixx]

Great advice so far.

I would start with the drive shaft - U joints and work out from their personally. Just a thought.

Please keep us updated, Thanks.