Front-end side to side wobbles

Hey guys,

I have a 2012 Freightliner Cascadia with a front end vibration (wobble) whenever I reach 45-50 MPH. The truck has 400,000 miles and this issue has been going on for about 3-4 months now. The following is what possible issues caused the wobble but after repairing, unsuccessfully did not fix the problem:

-The Kin Pins checked out fine
-The springs, bushings, hangers, etc all checked out fine.
-The front end shocks checked out fine
-Checked both drums, found one cracked. Replaced both drums and brake linings, but did not correct the problem
-Checked both steer tires, found 1 steer tire out of round, therefore I also replaced both rims and both steer tires and had them balanced out. Again didn't solve the problem
-Checked the oil in the steer axle hubs, but I didn't find any shavings, so I'm assuming the wheel bearings should be fine

I've visited about 4-5 shops thus far, and nobody has been able to find out what's causing this problem. I've spent lots of money as well. If anybody has any ideas/suggestions that would be greatly appreciated. Thanks in advance and I hope I can help other people with the same problem too.

 

Yes, it was aligned and there is no wear on the steer tires. Even the previous tires I had, there was no wear on the tires and all 3 axles were aligned

 

The shocks were replaced about a year ago and no

 

Sorry I didnt finish.
But there was no leaks noticed on the shocks, and I replaced them about a year ago. But my next step was to replace the inner and outer bearings on the passenger side since the cracked drum was also on the passenger side

 

Hello, I already checked the driveshaft alignment, center bearing for play and even the universal joint. The shop said everything was fine with the driveshaft and it had no issues. I also checked the self leveling valve and again everything checked out fine as far as height was concerned.

My next step was planning to change the inner and outer the wheel bearings on the steer axle. If that doesn't correct anything. Then I will be rebalancing the 2 steer tires again for out of round. Thanks for the help and I will update the forum to see if it helped at all.