Ball and trunnion 4 spd

From everything I’ve read, all 1964-65 a833s (which would use ball and trunion) had the 3.09 first gear. Whether slant six or 273. Of course there’s always time for people to swap gears.

I appreciate your creativity. Someday I’ll be doing some swapping with the O/D unit I have.

View attachment 1716068289

I've learned something today. Thank you. :)

Curiosity thus roused, I did a little further digging on this:
The 1966 Slant Six A-bodies still used the low first gear, whereas the 273 cars got the 2.66:1 first. This is probably where my mistake originated. In my mind, it'll likely remain the "six cylinder" gearset for the rest of my days regardless. Old dogs 'n' such.
There was no 4-speed listed for the Slant Six in 1967 U.S. models, but the '66 low-gear transmission assembly is listed--it was export Slant Six A-body only. Furriners could have one; we couldn't. I call shenanigans.
Per Mother, the 1974 "318" transmission was only used in the A-body. One would think the portlier B-/E-bodies could've made good use of that low first. So could've anything larger than an A-body in '64-'66 with a small engine, for that matter.
Having never seen one, I have to wonder whether the '74-'75 version had the input-shaft groove. It's a different part number and the early input was 1/4" longer, per the parts manuals. Curious.