Allison 1000 transmission specs, ratios, and information. The Allison 1000 5 speed (2001-2005 model years) and 6 speed (2006+ model years) transmissions have been offered mated to the 6.6L Duramax in GMC and Chevrolet pickups since 2001. Its heavy duty design and proven reliability have made it stand out in the 3/4 and 1 ton marketplace. Allison Transmission is an American manufacturer of commercial duty automatic transmissions and hybrid propulsion systems. Allison products are specified by over 250 vehicle manufacturers and are used in many market sectors including bus, refuse, fire, construction, distribution, military, and specialty applications.
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Allison Automatic Transmissions Heavy Duty
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