The core reason behind the development of the M5 was probably the rapidly growing demand for radial engines, which were in short supply. Therefore, other sources were approached in order to have the tank production still running in early 1941. In June, OCM 16837 authorized the installation of two Cadillac engines mated on a single crankshaft and hydramatic transmission and auxiliary transmission M3 (transfer case). Cadillac had been, indeed, rarely involved with wartime production until then. The combination of systems gave 6 speeds forward and one reverse, and a very smooth steering. The most obvious difference between the M3A3 and the M5 was the shape of the rear hull, much roomier.

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