the truck bounces pretty rough on the highway starts at 50mph. steering wheel does not shimmy when bouncing. changed a bunch of front end parts, alignment, tires balanced even replaced the center bearing for driveshaft and still getting the bouncing sounds like the death wobble but i cant figure it out any suggestions?

*1999 dodge ram 2500 24v cummins, top gun customz short arm 3 inch lift in front helper springs and block in the back think 1.5 inch of lift, brand new 285-75 cooper at/3 tires all around, replaced shocks all around, tierods, track bar*

 

What PSI are the tires at? Too high and they can cause problems with that.

Also, for future reference:
https://dodgeforum.com/forum/dodge-r...s-section.html

 

I think I'm running from 45-50 psi what is a normal psi I should use and if that's not the problem what else could be wrong or should I try checking?

 

Tires may be balanced, but are they out of round or flat spotted? You can have a perfect balance even with egg-shaped tires. Get your tires road force balanced and check back. After that, perhaps get your driveshaft balanced.

 

X2 Mine bounce at 40 but smooth out at 50. Put a little extra air pressure in the tires and see if it stops.