Vibration diagnostics

Anyone have a good diagnostic flow chart for diagnosing vibrations?

2012 Kenworth T660, 2010EPA paccar. 455/55R22.5 super single drives, 11R22.5 steer. Micheline xline

Vibration is worst when Bob trailing at 55mph. Almost feels like the front end wants to jump ou shop more then vibrate. Makes the steering wheel shake but really feels more like it's in the front end more then the steering wheel. Don't feel it in seat or feet other then whole truck is shaking you know. Driver side steer tire has wavey and excessive wear on outside trail bar only, no noticable bad wear on any other tires. Once in a while (might be in my head) it almost feels like the truck wants to wag side to side at full speed. Vibration is related to road speed, drive train stopp doesn't appear to affect it. It's hard to tell but vibration might be present at show speeds (very light it it is). Vibration really starts around 45, bad at 55 and mellows out around 60. Fully loaded (shotgun tanker) slight vibration at 70.

New steers in November, new driver at the of March. Balance beads in all tires. 3 able alignment in December. Noticed vibration in April, might be slowly progressing. Balanced steers on machine about a week ago, checked steer drums and found them round. King pins are right, no noticable slop in steer hubs. Spring bushings are worn but do not appear bad, front end appears tight (new tie rod with 3 axle assignmen). Bussing at drea link/Pittman arm may be worn, light clink in gearbox when shaking steering wheel with truck off. Drive lines and u joints feel tight, maybe a 1/16 to 1/8 of wiggle in carrier beingbe and slip joints.

Vibrations are almost as bad as electrical shorts to find for me, any help is greatly appreciated. Thank you

 

No change remounting steers. I'm going to try to find a socket to be able to remove wheels myself this weekend so i can try getting inside it all. I'll double check this one later when i shut down. Thank you

 

It's ridiculous isn't it...

 

Had a tire shop remove all balance beads from tires and static balance on their machine. Still getting vibration with empty and loaded trailer but it memig be a little softer now, it's hard to tell but not gone yet anyways. I'll know how much change after i get to run bobtail again.