Good questions by Dodge Dude.

The replies make me lol


^The resonant frequency is system dependent. It's a good point made about the shocks, however, their job is to dampen out. But you still need to find what is driving such resonance. So many people still have stock shocks to this day, which basically are worthless, yet they don't resonate.

I'd suggest you rebalance the tires. Could have lost weights. Something that needs to be ruled out anyways.

 

It is better now that I have lowered just the rear pressure by just 4 psi. It is still very bumpy though and gets worse the colder it gets which has been 28 degrees. Going on a back road at only 20-30 mph was very violenty bumpy so It can't be a resonance thing alone. I am thinking about bushings whether it be suspension or body and Im also thinking what is keeping the axles from moving from side to side?

The truck also feels a little shaky when accelerating from a stop or backing up. Like there is something the matter in the driveline or tranny.

I am looking at getting new rear tires soon. The fronts like new Nexan Rodians. The rears are goodyear wrangler and they do have some slight bulging

 

Side to side movement for the front diff is controlled by the track bar, the rear is controlled by the leaf-springs and the bushings in the ends of them.

If you have a shake from start you might have a engine miss.

 

Or a u-joint going bad. But, that wouldn't care about road surface... just what speed you are going at.

 

Ok so I got new tires, micheline radial x lt2 on 17" factory chromeplated wheels. It rides nicer but still gets shakey. Then I looked at the 4x4 **** and noticed how it moves about 1/2" between gas and brake.

So my quest is now into replacing driveline mounts, I shall look at rockauto to see what the possibilities are, base don parts available.

 

How's your track bar?