Odd Wub Vibration

Howdy all, I have a 2013 Toyota Tacoma that I’ve owned for the past 2 years now. I have done quite a lot too it and it is no longer the way it once was. It has a 3 inch lift on it and many other mods one could say. However as of recent I have developed this weird “wub” vibration or better to say noise. So Whenever I am driving and hit certain speeds, mostly around 55mph it makes that weird “Wub” vibration/noise. The noise feels like it’s in the front of the truck. It is not a fast vibration/noise, almost feels like the road is causing it but isn’t, and clears up rather fast. The weird thing being that it only happens when my foot is in the gas pedal keeping a constant speed. I have tried all I could think of to figure out this vibration/noise. My truck being lifted I have changed the carrier bearing drop height, I have changed the carrier bearing, I have gotta my tires balanced, an alignment, changed out cv axles, I have done one of the leaf springs as it was bent (leans a little, I’m going to replace the other one soon, just out of stock of the one I bought, maybe it might cause that vibration being unlevel?), I have done just about all I could and it’s still there. If anybody has had similar instances it would be a great help to give advice or any guidance on to what it may be because I am at a loss. Worst comes to worst I can live with it but I would like to know if I could cause many problems down the road. If somebody has had the same problem please let me know.

 

Throwing spaghetti at the wall here, but two things come to mind: ECGS clamshell bushing or the front diff drop.

OK4WD initially did the 3 inch lift and we somehow didn’t/forgot to mention those relatively cheap components can cause a lot of premature wear on components.

hope that gives something to work off of