I am thinking this is and overdrive box, but I have read all overdrives were aluminum case. I am going to look at it tomorrow and I don't want to buy it if its overdrive.

PP8335072
Im guessing it was early 75' Is there any way to tell from this if it truly is a non OD? I plan on shifting into third and seeing if its one to one. That is the front fork correct? This is my first 833 so still new, any help is appreciated.

If it has the original shifting levers on it still the non O.D. 3 and 4th gear levers are pointed up from the stud on the side cover just like 1st and 2nd gear levers are, all the O.D. tranny 3 and 4th gear levers are point down. If it is a standard non O.D. tranny then shove the front lever forward if it is pointed up to get in 4th gears, once there the input and output shaft should turn the same speed, one to one ratio if you shove the lever into 3rd gear the output shaft should turn slower in 3rd gear than the input shaft. On the O.D. trannys with the 3rd and 4th gear O.D lever pointed down and shoved forward should put it in O.D. and the output shaft should spin faster than the input shaft does, shove back it should be in direct, one to one Good luck, let us know what you find out, don't forget that more than one guy, including me, have transferred gears out of one case to put in another for different reasons

5072 is mid-June 1975 ('75 or '76 vehicle) - is there a VIN stamping? WAG no VIN = truck/van transmission?

IIRC the flipped lever on the shift fork resulted in a 1-2-4-3 shift where 4th is still 1:1 & third was the overdrive gear.

& I think all aluminum are overdrive, but not all overdrives are aluminum, again

Neither case is true. There were some aluminum cases that were not OD and there were iron cases that were OD. There may not have been any factory-installed aluminum non-OD, but I'm not positive on that.

My son's Dart has a '75 iron OD case with '68 18-spline gears and standard A-body main shaft...

No shifter or linkage. The only other stamping on it is C99129. I know I can measure the retainer but that can be changed.

That's not a stamping , it's a CASTING NUMBER and it's useless other than it being the casting number of a cast iron maincase , the same casting was used for all 833's .

If it's a 75 A body trans it is probably a non OD.

Never seen an alum NON OD outside of something sold over the counter thru Direct Connection ... maybe ??? ...

What model car/truck had an alum case non OD trans outside of a Superstock ???

It's easy enough to swap non OD guts into an AL case, BTDT. So even if we decipher the stampings it doesn't really mean anything.

The real issue is probably not the OD as much as it is the aluminum housing. The aluminum housing is the weak point of the OD trans.
The gear ratio spacing in the OD trans make it work good for most applications, the OD is helpful with rear gears of 3:55 for lower cruising rpm at highway speeds, and the cast iron case takes a beating. An iron case OD would be a great starting point, if such a thing exists. Gene

Won't Passon bush the aluminum case, for a price?

I said I did not know if any were factory installed, but that I didn't think that any were.

The case the OP is asking about IS iron. He doesn't know what gear set is installed. Iron ODs were very common at one time.