A836? Trans ID help needed

Well its plainly an F-body O/D unit. Probably a slanty. There seems to several other sets of digets on there. Do you know how to take a pencil rubbing? I think I see the faint remains of a VIN number, and above that perhaps a rebuilders no. Try the rubbing and see what comes up
It looks like an over-stamping. A repurposed box.
Except for the hard parts. the factory gasket kits and brass ring kits are a one-size fits all deal. The bearings can be matched up at a bearing supplier. The rear is a special order from the jobber and can be pricey. They are way cheaper at the dealer-go figure.The rear seal is one of 2 sizes and 2 styles; 4 items total;small/large,dust boot or not.The best ones are C/R; Chicago-Rawhide.