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The 2004 Allison was still a 5 speed. Also, stay away from the 2004 (and a half) duramax. They made it for 1 1/2 years. It had an overheating problem. No big deal if you drive where temps are under 85 or 90 or even higher if it is flat. But at 85 and steep hills like around Phoenix, you will over heat. GM could not figure out a fix for it (straight from the owner - friend - of a Chevy dealership).
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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