Has anyone used justice brothers automatic transmission conditioner on their Tacoma?

I have a 2014 Prerunner double cab v-6 w/ automatic tranny. i have the 40 MPH vibration & am wondering if the conditioner might help if it's coming from the tranny. I added "Shudder Fix" to the tranny w/ no difference in vibration. I had already had the Driveshaft refitted w/ spicer solid u-Joints & re-balanced & again ..no change. I wonder if my Goodrich ATX tires might be the cause? I had them balnced & rotated & it"seemed ("highly subjective ") to help some. Any ideas?

 

The only one I can recommend is LubeGuard.
As it's the one that transmission expert on here recommends.
And it's fixed a shudder on occasion. Not always. But definitely cheaper than a torque converter.