The GAZ-51 was a Soviet truck manufactured by GAZ. Its first prototypes were produced before the end of World War II, and the truck ended up using a heavily modified version of the Studebaker US6 cab, which was supplied to the Soviet Union in large quantities with the Lend-Lease agreement, although the chassis was completely new.

The Studebaker US6 (G630) was a series of 2+1⁄2-ton 6×6 and 5-ton 6×4 trucks manufactured by the Studebaker Corporation and REO Motor Car Company during World War II. The basic cargo version was designed to transport a 2+1⁄2-short-ton cargo load over any type of terrain in any weather. Most of these were exported to the Soviet Union under Lend-Lease by the US during World War II, since the competing GMC 6×6 CCKW design proved to be more suitable for Western Front conditions.