Couldn't find anything in my search here.
I've been catalog shopping for rear end gears (Jegs, Summit) and now have questions about the venerable 12-bolt truck rear. Seems there are "3-series" and "4-series" carriers, each with a different range of gear ratios available. The overlap appears to be 3.73:1, with lower ratios for the 3-series and higher for the 4-series.
Questions:
How do you tell the difference, if you've got 3.73?
Are they interchangeable in the same housing?
It's a '65 C10, and it seems easier to swap the carrier than the whole assembly.
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