Help,
my ram 4x4 vibrates through the floor so bad at 65 mph that you can't use the outside mirrors.
Replaced tires, balanced steel wheels, balanced rear driveshaft and u-joints, replaced steering stabilizer. My local dealer says they all do that?
It's just between 65 and 70. Any ideas?

 

might depend on your tires too, mine doesnt vibrate like that at all. what kind of tires do you have? large mud terrains would do that...

 

Is the vibration rotational? does it get worse after 60 or does it stay the same regardless of speed after 60? You might want to search over on Pavementsucks.com in the dodge forum and see what you can find. I'm sure they've seen it all when it comes to the suspension.