I dont get it.. why does the truck shake and hop 30-40? And then smooth? Fron t tires balanced and shaved for perfect roundness, even installed shocks on front which helped hard bouncing a lot. But why the shake? Tires lowered to 70#. Could it be something else? Bent or out of balance drive shAfts? They are new but long story short, the axle came loose before it was welded - on first mechanics test run 6 mos ago and broke the drive shaft bolts but the said it all appeared fine and bolted back up. I imagine if the drivestaft or joints were damaged it would be ar any speed.
I could take air pressure down more but why only at certain speed range?
