There were Saginaw 3 speed ODs. Late 60s early 70s I think. That Saginaw used the some case as the 4 speed. They are great units but hard to find now and usually expensive. The 3 speed ODs before that are OK but not synchro into first when down shifting. All the OD units are BW 10 or 11 models. Mostly 10.

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain