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Yes. All Duramax and 8.1L gas engined 2500 or 3500 series pickup trucks with an automatic transmission have Allison (1000 series) transmissions. Larger trucks (2500 series and up) also use the Allison transmission for their automatic offering but it is a different series that is similar to, but not the same as, the 1000 series used in the smaller trucks. Prior to the Duramax (introduced in 2001), GM did not use the Allison behind their diesels (6.2L and 6.5L) in pickups.

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Q: Does a 2004 silverado 2500 diesel have a Allison transmission?
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