I have a 73 002 trans that came from the factory set up for a T1, 1.6 mtr. The bus it was in came here from Europe. T1 mtrs in a late bus were quite common over there right up to 79.
I bought the trans and mtr from Geoff P. about 10 yrs ago. Geoff had tested the trans before I bought it from him. It was a spare for my dune buggy. Buggy is gone so no need for it. 5.375 final drive.
Let me know if you are interested.