Other improvements included a reinforced suspension, alongside a new steering and cardan shaft.

The styling also slightly changed, incorporating simple angular fenders, rather than the GAZ-AA's more rounded ones.

[2][3] Due to some engine shortages at the factory, some believe that the actual mass-production of the GAZ-MM trucks only started in 1940, since the GAZ-M1 engine needed to get firstly used in the GAZ-AAA and BA-10 vehicles.

[4] In 1942 a simplified variant of the truck, with the GAZ-MM-V index started getting produced, due to material shortages,[5] but limited production of the original "unsimplified" GAZ-MM continued.

After the Great Patriotic War ended, the production of all the variants of the GAZ-MM fully restarted, but by that time the Gorki plant was producing the newer GAZ-51 trucks, and so it seemed that the days of the GAZ-MM were starting to end, as GAZ wanted to free-up production capacity at their factory.