There should be stamped numbers on the ring gear that will tell you the gear ratio for sure.

You might contact Yukon Gear & Axle. They may be able to definitively ID your axle and help find a Posi for it.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.