The Continental R-975 C1 radial engine was originally fitted on M4 and M4A1 tanks. The C4 was a slighly different version, having cylinders with a different shape.
Later in the 50s, the French Army did rebuild a batch of M4A4s, removing the original Chrysler Multibank engines and replacing them with Continental R-975 C1s. These tanks were named M4A4T (T stands for Transformed).
General Motors GM 6046
M4A2 tanks and M10 Tank Destroyers
The General Motors 6046 engine (2x GM 6-71 diesel engines) was originally fitted on M4A2 tanks and on M10 Tank Destroyers (photos 1 & 2 courtesy of Michel Krauss, photos 3 & 4 courtesy of Massimo Foti).
Ford GAA V8
M4A3 tanks, M10A1 and M36 Tank Destroyers, M7B1 and M7B2 Priest SPGs
The Ford GAA V8 engine was originally installed in M4A3 tanks, M10A1 and M36 Tank Destroyers and on M7B1 and M7B2 Priest Self-Propelled Guns (photos 1 and 2 courtesy of Michel Krauss, photo 3 4 and 5 courtesty of Massimo Foti).
M4A4 tanks
The Chrysler Multibank engine was originally installed in M4A4 tanks (photos 1, 2 & 3 courtesy of Massimo Foti, photos 4 & 5 courtesy of Adrian Barrell).
Wright RD-1820 (converted as the D-200 to Diesel by Caterpillar)
M4A6 tanks
The Wright RD-1820 was converted to a diesel by Caterpillar Inc. as the D-200 and produced 450 hp (340 kW) @ 2,000 rpm in the M4A6 Sherman.
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