M931a2 death wobble

[Rooster828]

Ive had this truck almost a year and just before winter I noticed the truck rocked back and forth like there was a 2x4 strapped to the front tire making it undrivable anything over 5 mph , so I bought some new tires on rims thinking I had a bent strap ,and just swapped out the front I thought was bad . Instantly it felt normal again. Took it for a
Ride and everything was great until at about 50 mph it started violently shacking. I had to stop the truck to get the wobble to end. Pulled back out and at about 40 mph it started shacking yet again , I limped it home
At 30 mph which it drove smoothly at that speed. I will mention I have no wheel weight on the side I replaced because I am in the process of disabling the ctis and I have the valve and cover removed , where on the drivers side I still have the valve and weight on. Not sure if that would make any difference or not. Any thoughts ?

 

[Coffey1]

Remove the other weight and see if it helps

 

[162tcat]

If you replaced tires and rims but still have an issue I’d be looking at your wheel bearings next.


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[davidb56]

Put the front end on jack stands with the wheels off the ground and have someone move the steering wheel back and forth about a 1/2 to half turn, constantly while you inspect the play in the ball joints. Then bar the wheels with a large pipe to check the pins for slop.

 

[MrMikey4026]

Loose parts, tie rod ends, drag link. Not enough toe in.

 

[charlesmann]

i had the same issue. they had taken the ctis valve cover off. i didn't think much of it, didn't think it would be bad since it didn't weigh much. i was 100% wrong. i couldn't get above 45 mph without it doing the shimmy shake. i aired all tires up to 90 psi, instead of the 100 psi stated on the tire, took the valve and counter weight off the pax side, and cover, valve and weight off the driver side, then put it on the road. at 60 mph, it was nice and smooth. try removing all parts for the ctis and see if that helps, or put everything accosted with ctis and try that. its either all or nothing from the way mine acted.