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Old 11-06-2014, 09:40 AM   #1
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Chevy rear end ratios

I've been looking at new and used Chevy 2500's and want a 6.0 gas. As I understand it, a 4.10 is the only rear end offered on a 6.0. Using the codes in the glove box I've noticed a lot of 2013's and older have 3.73. Did Chevy change what they offered? How much is a 4.10 going to affect mileage when not towing? I'm presently towing with a 5.3L and 3.42 gears and have no problem with a 6800lb dry load TT. Just trying to remove the suck and blow.
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Old 11-06-2014, 09:55 AM   #2
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Quote:
Originally Posted by Eltonnoland View Post
I've been looking at new and used Chevy 2500's and want a 6.0 gas. As I understand it, a 4.10 is the only rear end offered on a 6.0. Using the codes in the glove box I've noticed a lot of 2013's and older have 3.73. Did Chevy change what they offered? How much is a 4.10 going to affect mileage when not towing? I'm presently towing with a 5.3L and 3.42 gears and have no problem with a 6800lb dry load TT. Just trying to remove the suck and blow.
I had a 2006 2500 with 6.0 and 4.10 gears. In that year, I'm pretty sure a 3.73 was also offered, but it also only had 4 speed tranny. With the newer 6 speed transmissions, you should do better with highway mileage unloaded and have better pulling power when towing. I believe the 6 speeds and the improvements made to the 6.0 made the 3.73 somewhat obsolete, that's why it was dropped.
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Old 11-06-2014, 10:27 AM   #3
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I had a 2005 2500 HD 6.0 with the 410 gear.
Driving unloaded I averaged about 13-15 mpg
loaded with camper 9-10 mpg.



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Old 11-06-2014, 10:56 AM   #4
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This spring I was looking at a 2014 Chev 2500 / 6.0. GM has both 3.73 and 4.10 rear ends, but the 4.10s are hard to find. The 4.10 affects GM's overall fuel mileage so they put the 3.73 out there instead. The 3.73 tow rating is only about 9,500lb and the 4.10 was 12,000-13,000 lb. And of course the gas mileage is different.
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Old 11-06-2014, 11:25 AM   #5
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GMC doesn't offer 373 in 2015. They may have in 2014. That's good to know.
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Old 11-06-2014, 11:32 AM   #6
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I have a 2012 chevy 2500HD with a 6.0 gas and 3.73 rear end. I could be wrong, but I was under the impression the 4.10's are hard to come by after the 6 speed auto came out. In any case, I pull a 9-10,000 pound trailer confidently with this truck and average about 9mpg.
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Old 11-06-2014, 11:36 AM   #7
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What are you getting without a trailer?
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Old 11-06-2014, 11:39 AM   #8
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I had to buy a Duramax because there wasn't a 4.10 within 500 miles of me. But now, I do love the D-max.


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Old 11-06-2014, 11:43 AM   #9
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I get 17-23 unloaded with the Duramax and 11-12 pulling the 5er@ 12,000lb


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Old 11-06-2014, 12:05 PM   #10
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I get about 14 combine city/highway mpg which is 2.5 mpg better than my 2004 6.0 got. This truck also is more stable and stops much better than my '04
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