A833 identification

You need to take the side-cover off and inspect the gears condition, find out what else is missing, and identify which gears-set is in there.
After 50+ years anything could be in there, the stamped #s aren't reliable.
I have changed the guts out of many broken cases, for whatever good case is on my stack.
Gear ID is here, at Brewers half way down page.
Good luck.
http://www.brewersperformance.com/orderinfo.php