2500HD vibration.

Mine were quad cab long bed 4x2. I never said the frame caused the vibration. However, the ultra rigid thin steel hydroformed chassis did tend to ride a little more jittery than the tail gate bending flexible heavy steel C channel chassis of the F250 or previous C channel Rams I owned before the '03. The dealerships were aware of the TSBs relating to the 4X4. They tried shims at the carrier and rear axle springs. They acknowledged the vibration at first and then denied it and finally said it's normal, don't bring it back. The driveline shop did all they could with the driveshaft. Odd thing is, it was intermittent. Sometimes bad enough to vibrate change in the ash tray and other times not even noticeable. I still think it was a harmonic engine/transmission vibration and not a balance or alignment problem. Ever notice the collection of vibration dampers under the Rams? The number has grown over the years. The old C channel Rams had one.