John Deere Powershift transmission

The John Deere PowerShift transmission was an eight-speed automatic transmission without a torque converter, used in John Deere tractors, including the iconic John Deere Model 4020.[1] The Powershift is not to be confused with similar John Deere transmissions (including the Quad-Range and the PowrQuad[2]), or with the Ford Ultra Command Powershift or the Allis Chalmers Power Director. The PowerShift was dropped in favor of the PowrQuad during the 1980s, and reintroduced in the 90s as a 16-speed model built by Funk, a company which was eventually purchased by John Deere. The 16-speed version was also used in the Ford 8630 series tractors as an 18-speed Funk Ultra Command.[3]

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