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What gear ratios were Duramax trucks available with? My 07 LBZ has 3.73's, but I'm not sure where that puts it in the ranking of available gears.

Thanks
-Rob
 

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3.73's were the only gears offered in the consumer available duramax's.

I remember reading a while back that it may have been an option on the cab/chassis commercial rigs to come with 4.10's, but not 100% sure on that..
 

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I recall following an 06 CCLB 2500 on ebay a couple months ago that the option sheet stated 4.10's but have heard from others that 3.73 was it?
 

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My watchlist must have expired.........it was a duramax and the option sheet stated 4.10's.......infact it makes me wonder whats in mine because I was reading guys say 1800rpm at 70 mph is stock and I'm running close to 2000.......think I'm gonna opt for 4.56's, I find when I'm pulling the trailer I need to keep it about 2000 rpm minimum and hate always driving that fast with that much behind you.......hate to blow a tire with the family onboard........
 

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With 245/75/16 tires, 3.73's, 0.71 5th gear ratio, you are looking at 2050 @ 70 mph.... assuming no torque converter slippage
 

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That puts you at 1975 @ 70 mph with 265/75/16's, and a .71 5th gear.

Can't you people do math.... dubbaya tee eff.
 

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I am getting 4.10's installed today but I am running 35's. its gunna be nice to have my low end grunt back.
 
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