You should have a t-19 wide ratio with a 6.32:1 granny low. There was a close ratio that had either 5.11 or the more typical 4.02:1 granny. Chances are you have a wide ratio more common with IH. But if you have a dana 300 hooked to it you have a one year only (1980) combo. Nice find.
![Cheesy :D](https://board.marlincrawler.com/Smileys/marlin/grin.gif)