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The Army had seven main sub-designations for M4 variants during production: M4, M4A1, M4A2, M4A3, M4A4, M4A5, and M4A6. These designations did not necessarily indicate linear improvement: for example, A4 was not meant to indicate it was better than the A3. These sub-types indicated standardized production variations, which were in fact often manufactured concurrently at different locations. The sub-types differed mainly in engines, although the M4A1 differed from the M4 by its fully cast upper hull; the M4A4 had a longer engine system that required a longer hull, a longer suspension system, and more track blocks; M4A5 was an administrative placeholder for Canadian production; and the M4A6 had an elongated chassis and additional armor, but fewer than 100 of these were produced.
While most Shermans ran on gasoline, the M4A2 and M4A6 had diesel engines: the M4A2 with a pair of GMC 6–71 straight six engines, the M4A6 a Caterpillar RD1820 radial.These, plus the M4A4, which used the Chrysler A57 multibank engine, were mostly supplied to Allied countries under Lend-Lease. "M4" can refer specifically to the initial sub-type with its Continental radial engine (R-975), or generically, to the entire family of seven Sherman sub-types, depending on context. Many details of production, shape, strength and performance improved throughout production, without a change to the tank's basic model number: more durable suspension units, safer "wet" (W) ammunition stowage, and stronger armor arrangements, such as the M4 Composite, which had a cast front hull section mated to a welded rear hull. British nomenclature differed from that employed by the U.S.
Vier uitvoeringen mogelijk;
- British Army, Mediterranean Theater, 1942-1943.
- Polish 2nd Corps, Italy, 1944-1945.
- Free French Forces, Italy, 1944-1945.
- U.S.Army, 1942.