Allison 1000 transmission
The 1000 series (and similar 2000 and 2400 series) is a line of automatic transmissions for on-road trucks. All are 5 or 6-speed electronically controlled units and are manufactured by Allison Transmission in Indianapolis, Indiana as well as in Baltimore, Maryland.
Initially the Allison 1000 was a 5 speed transmission, rated to handle up to 620 lb·ft (841 N·m) of torque. A new "Generation 4" 1000 was introduced in 2005 that added a 6th gear at the very top of the ratio ladder, making it a double-overdrive. For the 2006 model year, manual gear selection was introduced. This feature gives the driver greater control over the transmission, enhancing operation when engine braking or less frequent shifting is desired.
The Allison 2000 is rated to handle up to 620 lb·ft (841 N·m) of torque.
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