With successes such as the development of the steel-backed bronze sleeve bearings, a key component in the famed Liberty aircraft engine, Allison Engineering Company had become a major player in engine development by the late 1920s. Throughout the 1920s, the company achieved a range of innovative breakthroughs, including high-speed reduction gearing for aircraft motors and propellers and Roots-type blowers to boost engine manifold pressure.

In 1928 Jim Allison died, and Allison Engineering Company was put up for sale. General Motors purchased the company in 1929.

[1920s] Service has always been part of the Allison tradition. (Above) Signs on these buses parked in front of Plant 1 read "Allison Service Company." (Right) Commemorative medal honoring the U.S. patent for Allison's Gilman Bearing. The bearing was a key component in Liberty Engine connecting rods.

[1920s] Allison employees look to the future.

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