Chevy and GMC Duramax Diesel Forum banner

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Discussion Starter #1
hey guys im lookin to buy a 2004 gmc 2500 hd. i am just wondering if this truck has the 5 speed or 6 speed allison. also what model duramax is in the truck? how do i check?
 

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5 speed. and in most cases it has the LB7. 04.5 has the LLY
 

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Discussion Starter #3
ohh nice...thanks man...the truck in ur avatar is the exact look of the one im thinkin of getting....so is the 5speed still a good tranny? or no? and hows the lb7?
 
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