Old pinion - I am now pretty sure the McKinnon axle is not a posi but will make a final check in a couple of weeks when I get back from a trip. The ratio is about 3.90 based on the wheel turn method. Two anti clockwise turns of the driver side rear wheel equals about 3.87 turns of the drive shaft. I was very sure that this axle was a higher ratio than 3.55 which prompted me to take a closer look at the axle - surprise surprise! Many evil restorers out there!
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