Rear Tires Suddenly Lock Up Going 65

Also, I adjusted the bands as follows:

Kickdown band: 72 inch lbs, back off 2 1/4 turns, tightened lock nut.

Low and Reverse band: 72 inch lbs, back off 2 turns, tightened lock nut.

I used a quality torque wrench and backed off the lock nut a lot so it wasn't torquing against the lock nut instead of the adjusting screw. Made sure that the adjusting screw wasn't binding or catching up in its home and causing an inaccurate torque.

There was a bit of friction material sludge in the pan but no giant chunks of metal, a few slivers but who knows when the pan was dropped last. I put in a tranny cooler and an external wix tranny filter a couple months ago.

Having such recent tranny work and the gear oil change really makes me think it's related, but I'm not doubting anything.