page_title: Allison 1000 transmission
section_title: Allison 1000
hierarchical_section_title: Allison 1000 transmission / Allison 1000
caption_attribution_description: English: Allison 1000 demo
context_page_description: The 1000 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.
context_section_description: 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.
  Gear ratios:
  Applications:
  Chevrolet Silverado
  Chevrolet Kodiak/GMC Topkick
  GMC Sierra
  Hummer H1
  Chevrolet B-Series
caption: Allison 1000 cutaway
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