833 to 833OD

If you can find the guts to do the swap you could do it providing the case you want to swap into has the large bearing. Both OD and non OD trannies came with the larger front bearing. It's the very early A833's that had the small front bearing. There were three sizes of front bearing reatainers used on A833 trannies. Again the early trannies had the smallest with the small bearing. If your bellhousing has the 4.8" hole then you can swap retainers so you can use the OD tranny with the bell housing you have.

But, why go through all the trouble? The A833OD trannies are quite common in late 70's and early 80's pick-ups & vans. I pulled my A833OD tranny from an 81 D100 pick-up at the local pick-n-pull. Cost $75 for everything, tranny, bellhousing, clutch and flywheel. You will need to fabricate a bracket to mount the shifter to that uses the rear mount and positions the shifter forward to the a-body position but an hour with a hacksaw, drill and a piece of 1/2" aluminum is all that's requuired. The drive shaft will need to be shortened but again that is a $50 plus new u-joints at the local drive shaft shop.