From the pictures I can tell you this much,if it helps. The differential is a 1949 or later for sure. Through 1948, both cars and 1/2 tons had a single spring frontand rear. The single spring rear was above and parallel to the differential. It was bolted to the frame in the center with two U bolts. Each side had a shackle which allowed the spring to flex. The rear end also had an inclosed driveshaft. From 1949 and for the next they were pretty much the same with two springs rear and an open driveshaft
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