A833 Decoding pics attached

just trying to figure out what this transmission is the guy sold me thanks guys

pics are attached

Gonna go out on a limb and say truck A833OD transmission with that date. The stamped number is the trans and date.

input is 23 spline

output is 30 spline

I got two just like it on the shelf. The trans mount, the shifter pads, the date all scream truck A833OD to me.

Trucks are the same applications, in the appropriate years, as the B/E/C body units but in 82 there was only the truck left.

I use a tranny yoke on the output shaft and mark it and the tail shaft housing, and then mark the input shaft and the front bearing retainer so I can put the shift levers in each gear and then rotate the input shafts enough revolutions while counting to make the tranny yoke make one full revolution. All the O.D. NP833 tranny have a 3.09 first gear with right at .64 O.D. ,O.D. It is where 3rd gear is on the non O.D. tranny so to shift into O.D. you need to move the front (closes to the motor)shift lever towards the rear of the tranny Moving it forward should put it into direct gear, one for one revolutions
I have two of those also as well as one all aluminum Volare A body style O.D. NP833

All 833's after '76 are OD.