5th gear Overdrive?

Ok so if I understand you correctly, all post 78 5th gears will fit into my 76 trans, and then I can buy the 5th gear overdrive?
 
Just looked on mikesxs and they claim the od only fits the later transmission, but they say you should buy both. I only bought the one and have had no problems, put it in in an afternoon. I would still chance it on a $45 later transmission set in your 76
 
So what it is that you see visually different between the later gear and 78 and earlier when you have them laying side by side?
jefft

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