Question: Overall width of 1937 and 1939 rear-axel assemblies the same?

[Stinson]

Hell,
I need to know ASAP, is the overall width of 1937 and 1939 rear-axel assemblies the same for the model 75 large series?

I believe the 1937 7519 is the same as the 1986 Chevy half-ton truck but need to know if the 1939 7519 is the same.

Thank you,
Ty Stinson
CLC22330

[Steve Passmore]

Yes Ty, according to my 37 and 39 manual rear tread for both year 75 series is 62 and 1/2"   Also the same for 70 & 85 series in 1937 but it wont do you any good if looking for a higher ratio as their the same almost.
Does this mean you axle change is going "Pear shaped"?

[Stinson]

Hello Steve,
Great to hear from you! If both the '37 and '39 Cadillac 75 series have the same 62 and 1/2" then I know that the 1986 Chev Half-ton Light Truck 3.42:1 will work to take the place of my 4.60:1 with very little modification as already applied to a '39 Cad 7519. Just new machined flanges drilled for 6 on 6 studs pressed to the existing flange and welded on the back side will add only 1/16" to the width. This will lower my RPM to 2,100 RPM at 60 MPH. Watch for something in the mail soon...............
Many, many thanks
Ty Stinson