Based on the serial number, your father's car is a McLaughlin-Buick and was built in Canada at the Oshawa ON plant, not the US.
9462701236
9 = 1939 model year
4 = Buick
6 = Series 60 (Century)
27 = 2-door sport coupe with opera seats, 4-passenger
01236 = sequential number, range was 00001 to 04031 for Oshawa built Buicks
(Canadian model 4627 = US model 66S)
I don't know if everything interchanges between the Canadian and US built Buicks. Here is a breakdown of the axles for US built fullsize Buick's, but sounds like you may have gotten an axle from a 1937 Buick:
1937: 10 spline axles (Series 80 and 90)
1937-1955: 12 spline axles (Series 40, 50, 60, and 70)
1938-1942: 13 spline axles (Series 80 and 90)
1956-1962: 33 spline axles
1963-1970: 30 spline axles
1971-1976: 31 spline axles
Sean Smith
BCA# 42746
MBCC# 2122
SAH# 4186
Buickman Award 2015
1957 Special 4-door Riviera (hardtop) model 43
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