Our 8” dynamic for our 904 clearly said in the paperwork “not for transbrake use”, but my dad used a griner brake with it. That was a 400hp deal, and never had any issues.

I wiped out a thrust surface on the RB in my old Mirada when I went t-brake. Repaired the crank, and got a new converter. Didn’t have a prob after that. Both of those deals were learning experiences.

In the last year I’ve upgraded the 904 converter for use with a brake. Hope to play with it in my mid 9’s Duster. I currently run a 727, and both of the converters for it are brake ready.