Now that you have people out scrounging the wrecking yards for overdrive A-833, a web page that shows what they're not looking for, is in order.
Chryslers A-833 Is a slant 6 web site, but tells the whole story.
10, 18, or 23 spline; 4.35", 4.80", or 5.125" bearing retainer; long or short tail; aluminum or cast iron.
They are all called a A-833.
The 23 spline behind a slant 6 is the same 23 spline a-833 trans in a full size Fury or a short tail 23 spline in a Dart. If any A-833 could be thought of as being weeker, it would be the overdrive version.
The overdrive gear is very small and as a result, the mainshaft journal and splined hub is smaller. Top shaft in photo.
The OD was originally designed for use in the '70s Plymouth Volarie. Don't panic. It's still more than plenty strong.
The 18 spline Hemi has straight cut gears and sounds more like a truck trans than my SM465 does in 1, 2, and 3rd.
The overdrive Chevy version has 10 splines. I'm quessing that you may not have to limit your search for aluminum cases. In the cars, they switched alum and cast iron cases and tails at will and I wouldn't be surprised if they did the same for trucks.
