GM Differential Identification

[ClassicCar.com]

I have a 1961 Corvette. The GM part number on the differential is: GM H277 3725899 29 I would like to know what car it may have first been installed in and the year of manufacturer. I am having difficulty in obtaining the correct U joint for this differential.

Trooper

[ClassicCar.com]

The H277 is the date code. It is August 27,1957. Not sure what vehicle it would originally have been in. Could have come in any 57 or 58 chevrolet.