Help converting my 64 to 66 23 Spline 8A33 to an overdrive ?

junkyardhero said

you lose the big input bearing, but you can use the existing bell which is nice. ostensibly, you keep what, the case, bearing retainer and counter shaft?

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Yes, the nice thing is you don’t have to change everything. Plus, if I don’t like how the O/D drives, I just pop the original A-833 back in. The more I do of the conventional “wisdom”, the more I just like the original stuff, for the most part. Nothing wrong with an A-833, a set of 3.23 gears and a sure grip. That said, my 66 has the O/D as I described with a 273. Works fine for me.