2002 astro vibration/shudder problem

[GeoRandy]

Bravo

[Hegedus]

mine is a 99 chevy astro rwd. it only shakes when i'm stopped, but if i shift it into neutral it stops. I've already tried replacing the brakes, rotors, bearings, u joints, serviced the transm, serviced the read diff, and replaced the tss. All with no improvement. any suggestions anyone?

[Hegedus]

and i almost forgot i have also replaced all 4 tires, the inner and outer tie rod ends, sway bar bushings and linkages, had all the new tires balanced and aligned and still no diff in the vibration.

[olwebley]

My '94 Safari has a similar problem, The vibration is worst at 110KMH. All the wheels have new rubber and have been balanced. I took the driveshaft (there was a smooth spot on the shaft that suggested a thrown weight) to a balancing shop and it did nothing to alleviate the problem. I have to think that it was not balanced at that shop. I'm considering going to a wrecker to get another driveshaft.

Does anyone know how to calculate the driveshaft's rpm at any given road speed?

[olwebley]

This is a reply to Hegedus: Maybe motor mount(s)?