Help me out Guru's...Speed wobbles BAD

OK guys,

Ive owend a few trucks that i have bagged myself.. this is m first dually.. For the life of me i can not figure this one out..

If i have enough pressure in the front bags ( cant tel how much, no gauge)
to lift it up to stock height then at about 40 MPH i get Aweful speed wobbles.. i mean BAD.. shackes the whole truck to pieces.. If i drop the PSI to ride height (Low but not draggin) every thing smoothes out..

I have it baged with top plates and bottem cups.. i removed the swaybar... but that was along time aga and had beed driven sence...

Im out of ideas.. help me out guys..

Alingment maybe?

If you think its coming from the back... it could the pinion angle

mine did that also and had it aligned 2 times never could get it to stop then one day had it off the ground to change the front brakes turned out the upper control arm on the passender side had worked loose and was woubling around on the bolt tight end it up and fixed the problem so check all of ur control arm bolts to make sure they haven't came loose

remount the swaybar that should fix it it kinda binds the two front wheels together so they cant shake , alighning the wheels on the current low setting (the one that stopped the wobble ) at ridingheight and try again , couple of clicks harder on the shock absorbers (YOU DO HAVE SHOCKS I HOPE if not forget everything i mentioned above and mount them) , it doesnt hurt to check the total suspension as mentioned above

cough.. I .. uhh... umm.. removed the shocks....Cough..

It is definitely due to no shocks. It is called Death Wobble from your tires, and depending on tires and sizes, they will do it at different speeds. On my dually when I didn't have shocks for a couple weeks, it did that too about 45mph. On my rockcrawler, it does that at a couple different speeds 45 and 65 or something. Shocks will get rid of that

shocks it is then...
Thanks gents