I think it was on deceleration only. It felt like the opposite of a bad u-joint, which often show themselves during applied throttle.
No matter what, you should check the drive flanges for looseness - you never want that, and I know plenty of Toyotas with flanges that have worked loose over the years.
No matter what, you should check the drive flanges for looseness - you never want that, and I know plenty of Toyotas with flanges that have worked loose over the years.