I'm sure its been asked a million times and in reading the forums there's a plethora of info:

I think death wobble has begun knocking at my trucks door. 2018 F250 CCLB (platinum with ultimate tow package)

Threw on the winter tires Saturday (BF Goodrich KO2, pattern that came on my raptor when I had it) as snow seasons coming and id rather not make Santa's sleigh go sideways. Little bit of rumbling and off balance but figured it was since I rotated them since where they were when I took them off. Sunday I drove a little but nothing absolutely crazy for rumbling and off balance
Flash forward to today. Driving home, and hit an expansion joint for a bridge at 65ish. Truck had a fairly substantial wobble for a while until another bump where my speed was down to just under 60 and it seemed to stop. Granted the truck has a FOX stabilizer that was installed less than a week after I picked up the truck to try and avoid/help should this day ever come.

Probably going to swap out the stabilizer since its going on 3 years old now. Any other recommendations? I know there was talks that you could adjust the caster of the front axle by like a degree backwards to change the centerline and therefore help stop this. Any other advice to help make this nuisance go away?

In Short: Truck has fox steering stabilizer and BF Goodrich KO2, acted like there was little death wobble today but it stopped itself fairly quickly. Looking for recommendations

 

Other members can answer better than me. You should not just change the steering dampener. Check all the front end bushings and knuckles and linkages etc to see if anything is worn out. Find the cause, what is getting loose or has play. Check the front driveshaft u-joints too. They say the extra caster is helpful like you thought. It is always good to re-check wheel balance.

 

Was the bridge expansion joint on an angle to the road (less than 90 degrees?).

 

IMHO, it’s likely the tires. I’m still on the original Michelin’s with about 35k. When I drive the truck after it sits a few days, I get a little wobble out on the highway for a bit and it goes away. The truck is smooth afterwards. I keep thinking...oh no death wobble coming! I had the fronts road force balanced recently. While the occasional wobble is better, I was told one of the tires is borderline of failing the road force balance. I’m looking forward to replacing these tires next year. Likely the Cooper AT3(?) or Toyo AT3. Good luck, hope you get some resolution. Also, I swapped out my steering stabilizer with a Bilstein. Not sure I can tell a difference, the stock one was pretty stiff.

 

Did it do this before you put the snow tires on? If not, you have your answer.

 

What is the road force number that qualifies as a fail?

 

For true death wobble, the track bar is always the first thing to check. Very little play in either end can lead to very big wobble! A good/new steering stabilizer can band-aid over the symptoms to a point, but that's not a cure.

 

Ill make sure to check the track bar so thank you. The stabilizer replacement was as you said a Band-Aid.

As previously mentioned it was this noticeable with the winter tires but had a small amount of wobble when I ran a set of brand new stock Michelins over the summer. Small amount of wobble which disappeared the minute I started to pull a trailer. Truck is definitely gonna get an alignment soon, just have to finish a brake job on the Yukon so the lift is open.
Haven't noticed any play or slop or any looseness in the front end when I do its oil changes and such. Perhaps I wasn't looking in the right places. Ill pay particular attention to the track bar. I don't think I balanced my tires perfectly last season so I'm sure that's not aiding the situation at all.

 

Yes the truck had a little bit of wobble when I had a set of brand new set of stock Michelins on the truck. It seemed to "intensify" to a small degree so I think they need to get rebalanced anyways. They didn't seem like they wanted to balance quite right last time so well see what happens.

 

Yeah a good balance is part of the equation along with rotation. I've read on here that even new tires can be out of round thus no matter how well they're balanced, they're gonna have a little wiggle. Every time I get my OEM Goodyears rotated, the guy wants to rebalance them and I tell him no, they're smooth as silk. Lucky I guess.

 

I do a tire rotation with each oil change (about every 5000 miles) and there was a little bumpiness as they smoothed out in the new position but these last 2 sets have been worse. I think rebalancing is gonna be required unfortunately. They never seemed to want to balance quite right the first times I did each set.

 

UPDATE:

I put the truck on the lift to get an idea of what's going on. I have no broken boots or such, but I do have a fair amount of play in the track bar. If I grab it near the knuckle, I can rotate/twist it a couple of degrees. nothing insane but I believe it shouldn't be moving period. Fox steering stabilizer has been on for the last 3 years/30k miles. Is starting to show some wear. Threw the original factory one on, and likely going to take to the dealer. Does this sound like Death Wobble in the making? I think I was able to keep it to a minimum with regular tire rotations and the upgraded stabilizer. This truck is gorgeous and probably the best truck I've ever owned. Would like to take care of this before it turns into something much bigger

 

Depending upon your usage, it's time to rebuild it. The back page of the manual gives the service interval:

 

Likely going to order a new stabilizer and a new track bar. Possibly throw in a drag link since I'm under there already. Waiting for an opening at the dealer for them to take a look at it

 

Track bar bushings (and possibly sway bar links). My 2010 started mild, dealer guessed and threw an expensive alignment at with no change, was due for tires so I replaced them also, no change. Over the course of a few months it worsened (it got horrible). Was in for an oil change they came out and said track bar and sway bar link bushings were worn. Replaced them and the problem went away immediately. Drove like a Cadillac after that.