Odd vibration

I have a 2017 access cab SR 4x4. When I am going around 50mph I get a small vibration that lasts for about 1 second every 2-3 seconds. It is more noticeable from the driver’s seat than the passenger’s. I have changed tires and wheels with no change in the vibration. I live on a small island and can’t get above 50 to see what happens faster. Any thoughts or suggestions?

thanks

 

When you change the wheels and tires, is it identical vibration?

 

Welcome to TW and your endless search for vibration(s) with truck tires and sprung suspension.

 

Yes, exact same vibration

 

Its probably normal, or check the driveshaft carrier for proper alignment.

 

Going up a slight uphil or when you dragging?
If yes, that's the torque converter. Have you done TSB?

 

It sounds like the diff needle bearing. If it goes away when you flick on 4Hi, that would be it. There are TSBs to replace it or the diff. The real fixes are either the ECGS bushing or the free hub mod.