My 04 CTD is solid at hy-way speeds even pulling a heavy trailer. It's not
lifted. BTW: Mine is a 4X4.

Al

Try a tire shop and tell them what is wrong I'd bet it's your tires being
out of balance

I can ditto Al's post in my '03 2500. I've never had a problem.

Did it do it before the lift and oversized tires? If it only does it
after a bump, I would suspect the shocks. Also, try changing the air
pressure in the tires.
John

John,
This isn't rocket science. Adding five inches to tire height with a lift kit
using your original wheels, additional unsprung weight, with no other
changes, puts safety in question. The lift kit puts your bounce and jounce
ratio out of center, which will cause severe toe change on bump encounters.
The angle of incidence, which is the imaginary line through the center of
your king pins/balljoints should intersect the center of the tire's contact
patch on the road to effect neutral loading of the steering arms during
bounce/jounce, braking and acceleration. By adding the extra tire height you
have shifted the contact patch inboard and now the intersect point of the
angle of incidence is outboard which creates severe compression and
expansion loading of the tie rod, the tie rod ends and pitman arm. This is a
very unsafe situation. I would do 2 things immediately. I would add 1/4"
spacers to the wheels and use gas filled heavy duty shocks. This is a
Band-Aid, not a total fix, but it should keep you from killing yourself or
someone else.
Steve

It is the result of the lift and the tires. Check alignemnt and balance
and pay very close attention to front axle caster angle too. It likley
needs more negative caster. (top of axle tipped forward) 35's is a lot
of rubber to stabilze and beyond its orignal design.

My stock 04 2500 is rock solid on the highway with or without a
trailer. The fix may be easy. Go back to a stock set-up and enjoy the
ride.

Woody; 95FXDS