833 to 833OD

It is very easy to make a standard small bearing 833 into an overdrive. You just use the small bearing and front bearing retainer from the 1:1 box. All gears and the main shaft need to swapped. Use the cluster pin from the 1:1 box. I did this with spare parts back in the early 90s and the guy who bought it put directly into his 68 318/4sp Barracuda and loved it.

Gear sets are not mix-n-match. You can't just change one gear ratio.