Yes that trans was used by Tom Hager and a few other local guy. I was a good friend of Tom Hager may he RIP. But about being his design and used by Mark Marten I would have a lot of questions on that.
That trans was a hot item for a lot of local dirt track cars. We used that same trans in our car but not with the quick coupler. With the coupler it was used with a Quarter Master clutch