Ok, found what model I have. It is for sure a Pro .15. Obviously an older model, but it's in beautiful shape. A new transmission fully built is about $55-$60 on ebay right now. Rather than tear this one apart, I'm gonna put it in the spare parts bin and call it a day. Something breaks on the new transmission, I've got spare parts. I managed to get hold of an exploded view of the .15 transmission and it's the same tranny as the 2.5. Gonna clean her up and get rolling!