Originally Posted by coffeeshield

So I wanted to follow up. I took my 2010 Trail to the dealer. They confirmed the shudder between 30-45 (and 40-50 as well) as the torque converter.

He was a straight shooter, said that they don't do trans flushes there, but they do at another Toyota Dealer.

I took it to that Dealer, did the full flush (important: not just a fluid exchange or change), and 2 days later I have no shudder. It was happening multiple times a day prior to that.

I will come back and let you know if it resurfaces -- but I knew how to reproduce it before, and couldn't do it for the last two days. Very hopeful, and might be worth the $300 gamble for you guys.