833 B to 833OD

AJ/FormS said

I could not fit the o/d cluster into any of my 3 cast iron non-o/d boxes. My cases would have needed to be heavily clearanced.
That's no-never-mind for you cuz the box can just go into the B-body. All you really need is a long O/D mainshaft, and bolt your B-body tail up to the A-body box. That's what I did.
Take it easy shifting into O/D, it's been my experience that, that gear is not very strong.

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I've done 3 or 4 conversions into a standard iron main cases with no problem. However, they were all Early "A" body main cases that had the low first gear and small 307 front bearing. It really tightens everything up. I do remember people looking funny at me, like it could not be done. Maybe the newer, 68 up, cases were filled in for more strength?

The long answer to the original question is: What is said above, plus be sure to take all the gears, cluster gear, and input shaft from the OD. Get new bearings, roller and needle; a new cluster gear shaft; thrust bearings; gaskets; and seals minimum. Another thing to be aware of is that the side cover and reverse lever are usually matched, so keep them together.