Torque converter vibration

On my 2010 tocoma sometimes the torque converter vibrates at a stop light. What’s a good additive to use to reduce this?

 

How did you isolate the vibration to the torque converter? I don’t recall hearing anyone complain of a vibration when stopped, usually it’s around 40 mph where the lockup doesn’t work well. For that Lubegard has a ShudderFix product that sometimes works but often doesn’t.

 

I’ve been a mechanic for about 41 years now and noticed the vibration at stops, I can make the vibration stop by releasing pressure on the break pedal. At this point it’s my instincts telling me to start at the torque converter. The truck just passed 250,000 miles and I’ve recently changed both motor mounts, transmission mount, carrier bearing. And the breaks are new.Lat transmission oil change was at 240,000.