Packard's Ultramatic transmission was the creation of the company's chief engineer Forest McFarland and his engineering team. The magnitude of this accomplishment is illustrated by the fact that it was the only automatic transmission developed and produced solely by an independent automaker, with no outside help. Devices like the Ultramatic were being tested and designed by Packard from 1935 on, but none satisfied the perfectionist engineer. The Ultramatic's development was halted, as was all automotive work during World War II, but resumed in earnest during 1946.