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just traded my 03 crew cab 8100 w/allison for the same in the duramax w/allison... has anyone on here went with a gailbanks power kit in there trucks? if so what type of power increase and gas mileage increase did you get? a couple guys around my hometown increased there mileage by 30-40%... i was getting 8-10 with the gas and am getting 14 with the diesel , but its not broke in yet i hope to get up to 18 with it then....also it increases the power approx. 125 hp 375 ft lbs of torque.... oh yeah ... im going to relocate the local trailer park when they are at walmarts.......
 

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I'd be careful about mods.

The allison tranny is rated to like 10 more foot pounds than stock in the current D-max.

Mine is stock to the exhaust tip. I don't want to hurt anything and it has plenty of power. :thumb:

In an ex-cab 4x4 2500 I (used) to get around 19MPG commuting. A little over 20 on the highway if I'm easy on it.
 
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