Just a couple of things I’d like to add. If you’re planning on driving the car hard(and why have a 4spd RR if you're not) I personally would not recommend it with the aluminium case 833OD. Besides the bearing problems I’ve had a couple of those with cracked cases over the years and am not real impressed with their durability.

Depending on the gear ratio of you RR you may not be real happy with the gear split between 2nd and 3rd gear. It’s pretty noticeable if you running something like 3.23 but not too bad with say 4.10s.

There are some cast iron case A833 ODs out there in both long and short tail shaft versions (the short tail shaft version places the shifter somewhere in between the shifter location of the 2 positions on the long tail shaft version). All the cast iron case units I’ve come across have also had the larger output shaft rather than the smaller one used in the aluminium case versions.

I’m not sure what the factory application of the cast case OD trannys were as the ones I’ve had were pull outs when I got them but I suspect they came from trucks.

All that being said I am currently running a cast iron case A833OD transmission between a Tri-Power 354 Hemi and 4.10 Sure Grip in a 57 Plymouth and I do tend to occasionally run it pretty hard . So far it’s held up very well and OD droping the effective ratio to approximately 3.00 makes it a nice higway cruiser.