What causes speed wobble that's not tire balance/alignment?

I have a pretty bad shake at 60-70mph, ish. Stops after going past that, though I usually just drive under that speed.
I've had my tires balanced and aligned twice, just to be sure. The first time it helped, but in the year or so since it's gotten worse again. No noticeable cupping on wheels and no tire place has mentioned anything.
What could it be? Should I be worried about tie rod ends/ball joints/wheel bearings? Should I be off the road? What should I check and how?
No other symptoms that I can tell; I don't *think* the steering feels loose but I'll listen to your favorite way to check that.

edit: I should mention, new shocks all around, and new discs up front. Though I did have to right my truck after a partial roll (see my post history)

 

Have you ever changed the wheel bearings and how many miles are on the truck

 

Nope, and 190k. No whine or roar from the wheels.

 

Have you ever changed the shocks ?

 

do you have all of your lug nuts?

 

Could be a broken belt in a tire. Sometimes they'll balance ok.

Rotate tires and see if vibration moves.

 

The last balance was a year ago?
Roadforce balance?

Not a walmart balance right?

 

There was a ballance a year ago, and then one a month ago after the roll. Nope, not walmart, and the guy passed muster with me for 'knowing his stuff and actually giving a shit about his work'.

 

read my post. New as of 2k miles ago.

 

Hm, i don't think it was road force. Could it make that huge of a difference?

 

Yes. IF there is no tire damage and IF the tech knows how to use the machine right and IF they are willing to do the extra work needed if the machine indicates it's needed.

 

check your tie rods for play

 

Best way to do that, anything besides having someone in the truck wiggling the steering wheel and me underneath watching?

 

absolutely, pull the emergency brake, jack the front up so both the front tires are off the ground, and hold the tire in the 9 and 3 position and move it back and forth. any small amount of play will cause a vibration at high speeds. you have inner tie rods, and outer tie rods. the outer is rod is the one closest to the wheel, the inner tie rod is the one with the boot on it. it helps if someone is under it looking to see for movement, but if you dont have someone else you can just go by feel. a good tie rod wont have any loose play, the tire will be tight.

 

I just moved and just have a single jack with me- is it still useful if i do it one wheel up at a time?

 

Check your ball joints as well.

 

How do?

 

This article is more thorough than I'm willing to type out on my phone. They may not be the culprit themselves but if your steering geometry is off and your ball joints are at the end of their lifespan you'll be a position to develop that harmonic vibration.

https://www.google.com/amp/s/m.wikihow.com/Check-Ball-Joints?amp=1

In Jeeps, at least.

 

yes you can do it one at a time

 

thanks!