Re: 72 3.07 posi rear
Yes, Geoff. The 3.73 is a 4 series gear. And, yes, one can order thicker gears to fit into 3 series carriers. I actually ordered a 4.10 gear to fit into this rear I have, but my builder said I wouldn't be happy with the Richmond gear I had ordered. I also wasn't really to that stage, so I sent it back, and ordered some more stuff I needed now anyway.
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