Quote:
Originally Posted by rotorwrench
I've seen ten spline in near all the mechanical brake models. late 38 or 39 seems to be the start of the 6-spline stuff. There is a difference in the spider gear and axle tooth counts for the earlier 10-spline types too. Mercury cars just had a solid one piece driveshaft & pinion.
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The '38 was the last of the 18 tooth axle/spider. !939 began the 16 tooth. As with many changeovers, there was likely some overlap, as they were interchangeable (as sets).