Guys (and girls) i think iv got a case of the death wobble.i looked on here to see if someone else might have had the same or at least remotely the same issue but i couldn't find anything.
The trucks an 83 F250 on 33 12.5s and lifted 6 inches the seering is all stock except tie rod ends. I replaced those last summer.

 

Cant say I have ever heard of death wobble on a IFS before

 

What is a death wobble.

 

When i get to a certain speed the front wheels start wobbling and shakes the entire truck almost to the point of loosing control of the truck.

 

If you can't see or feel the slack or play in your steering by wiggling the steering wheel back and forth(have someone do it and you observe the movement in the joints,etc)...I would suspect a belt slipped on one of your tires...

If not that, jack it up and check for slack in bearings,etc on each wheel....

That would be a couple of places to start...Trav...

 

I assuming it's a suspension lift I don't see how you can do a 6" lift with stock suspension components and keep your steering geometry correct. Maybe you can on Fords, I don't know, but....
If your geometry is correct completely shot ball joints might cause it.

 

Its like driving a 2-ton shopping cart with a bad wheel. Whole truck front end gets into a harmonic that will make you feel like you are in a paint shaker.

I had this happen to me last year, twice. When I asked around what might be the issue - Ball Joints, Steering Linkage, Bushings, Bearings, etc. I was told that it could be any one, combination or all contributing.

I started initially with the ball joints, but as I got into it found out how far deteriorated and worn things like my steering rag joint, beam and radius arm bushings, and everything else was. Ultimately I ended up replacing:

Steering Shaft (new borgeson - well worth the $$)
Steering Linkage
Ball Joints
Axel and front prop shaft u-joints
Beam pivot bushings
Radius Arm bushings
Radiator and all four cab mounts
Motor mounts
Coil spring isolator
Axle / Hub Bearings
Hub Locks (found both to be broken)

It was amazing how marshmallow soft all the rubber bushings and mounts were. Replacing them was a pain in the a$$, but well worth it. The steering went from downright sloppy to almost responsive.

 

My 92 F250 has done it. The tie rod at the pitman arm was BAD, and the bolts that hold the IFS pivot bracket to the crossmember were loose.

 

I checked the steering parts and its obvious theyre 30 some years old so ill start there and see if that helps out

 

I vote pivot arm bushings. Mine created a terrible death wobble that made it scary undrivable. After replacement it was fixed.

 

Ill give that a try!

 

I had that with my '58 F-100, it turned out to be insufficient caster in the front end. If you lifted it without using different radius arms (rear of the IFS) then you probably have either insufficient or negative caster in your front end.

Since yours has leaf spring IFS, the caster is set with shims on the springs, camber is done with eccentrics on the upper ball joints.

 

85lebaron is on to something. I used to work in a suspension shop, large trucks, and we'd occassionally see the same issue with the big trucks. 90% of the time it boiled down to caster because of a spring change which adjusted ride height.

 

Caster and camber are adjusted with the bushings on the upper ball joints on TTB.

 

According to AllData, on the F-250 leaf spring TTB, the caster is done with wedge shims on the springs.

I still hold that if he lifted it 6" without changing the geometry of the front suspension, he will have a caster issue. I fixed my '58 by "cheating" as i had gone from the original Mileage Maker 223 to a '57 Thunderbird Special 312 with a T85 overdrive 3 speed. I bought a set of 1/2 length helper springs and installed them on the rear portion of the front springs. Caster issue solved! The truck drove great after that.