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I would guess 3.07 to be the most common (for C10's anyway). , but i don't have any numbers. Just about every 350/auto truck has 3.07's...and that is what most of these trucks are. 3.73 is an easy second...with all inline trucks coming standard with 3.73's and most 307/283 trucks too.
I've seen like one in person with factory posi, lol.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
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