1996 F-250 7.3 dana ttb 6" Tuff Country suspension lift. I have replaced center pivot bushings, complete steering linkage including pittman arm (skyjacker FA600), steering gearbox, upper and lower ball joints. Still have a severe shimmy at 45-50 mph. I cannot find any shop in my area that I trust who will talk to me about alignment most just want to keep throwing MY money at it. Tried to do it my self believe I have toe and camber good but am thinking it must be a caster problem. Did most of this myself but have run out of knowledge. Would like to get this thing so I can drive it reliably. Yrouble is I love the damn thing. Thanks in advance for any help.

 

I'm having the same issue. I've already had a computer alignment, but the shimmy is still there. I'm currently looking at the rest of the DL to find it. Right now, the shimmy is too harsh to pass inspection, much less be driven on the highway.

 

Its probably a tire balance problem.

 

Or it could be a broken cord in one of the tires.. something that's not real obvious unless the tires are spinning and then it jumps right out at ya. Jack it up and have a look, have seen this myself on numerous occasions.

 

It's not tires or balance checked belts this morning had balance checke 2 weeks ago. I am nearing my wits end. Probably should sell it for parts has a good running 7.3 with a new oil cooler and fuel pump doesn't use any oil

 

What size/ brand tires do you have? I see 6" lift and think big, square, bias tires. Are you feeling the shimmy in the steering wheel or the seat? I did alignments for about 15 years and afaik, I didnt fix one vibration. I know its possible to have a caster shimmy but its really rare and when it comes in at a certain speed and goes away at higher speed its almost always a tire balance issue. I tried airsoft pellets in my dump truck tires with good luck. Here's a site that sells tire balancing beads but you can get airsoft pellets at walmart and weigh out the proper amount pretty cheap. Tire Balancing Products

 

tires are standard size. I believe 265/75/16. Shimmy is in the steering wheel at 50 mph so bad I can barely keep it on the road. I was thinking way to much caster but don't know what it should be or for that matter what it is.

 

Don't be cheap and put out the $125 for a good computer alignment. They can adjust everything, and make suggestions for needed repairs, if it's from the steering components.

 

You could rotate the tires and see if the shimmy moves to the rear. I've always just got the caster as even as possible on the TTB trucks, as long as it has some pos caster they seem to handle fine.

 

aka: Death Wobble. It's bad enough with stock tires and suspension, lift kits and big tires make it worse. As mentioned it is most likely a tire balance issue. Been there, done that.... Some tires can be a nightmare, big lugs can be the worst.