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Old 12-08-2014, 05:49 PM   #41
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Most of them that I've seen so far have 3.73s, but honestly, our trailer only weighs 5000lbs. If a 5.3L with 3.42s can pull it up a 6% grade at 55-60mph(which it can because I've done it), I'm sure a 6.0L with 3.73s will do us just fine It really isn't a power thing for us, I just don't like being over our GVWR all the time. We also had a couple trips with really strong crosswinds, it wasn't complete white knuckle, but I was very glad when we stopped.
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Old 12-09-2014, 05:46 AM   #42
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If I'm not mistaken the 6.0 comes standard with 4.10 gears while the Duramax comes standard with 3.73 gears.
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Old 12-09-2014, 06:11 AM   #43
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Quote:
Originally Posted by Adk Camper View Post
If I'm not mistaken the 6.0 comes standard with 4.10 gears while the Duramax comes standard with 3.73 gears.
My '07 Z71 has 3.73ís. I'm not the original owner, so I'm not sure if it was ordered with them, or if the Z71 package puts the 3.73 in.

Either way I'm satisfied with them, the gas mileage is bad enough all ready.
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Old 12-09-2014, 06:45 AM   #44
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On my Avalanche the tow capacity is 10,000 lbs with 3.73 and 12,000 with 4.10. I made sure I got the 4.10 before I purchased. Makes a big difference..
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Old 12-09-2014, 07:50 AM   #45
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If I'm not mistaken the 6.0 comes standard with 4.10 gears while the Duramax comes standard with 3.73 gears.
That only started with the 2014 model year.
Prior to that, 3.73 was standard for the 6.0 gas engine.
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Old 12-09-2014, 09:04 AM   #46
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That only started with the 2014 model year.
Prior to that, 3.73 was standard for the 6.0 gas engine.
Got ya. I'm glad I have the 4.10 gear.
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Old 12-09-2014, 10:27 AM   #47
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Does the 3.73 result in any better gas mileage than the 4.10 in daily driving? Since I'm only towing about 6000#, I would have rather had the 3.73 if it gets better daily mileage. The dealers don't order any with the 3.73 for stock. The 3.73 option is an extra $100. The one that I got off the lot 2 months ago was exactly the way I wanted it, including the color.
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Old 12-09-2014, 11:03 AM   #48
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If you intend on towing less than 9,000 lbs, the 3.73 is preferable.
Our TT is about 7800 loaded, and we consistantly get 9.5 MPG (US gallon) when towing. In mixed city driving (solo) we get about 15 or so MPG (US gallon). I have the 3.73 rear end with the 6 speed tranny. From what I have read elsewhere, the 4.10 rear end will give about 1.0 MPG less.
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Old 12-09-2014, 04:27 PM   #49
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Here's a question that those of you with a 2500 might be able to answer. Are you having any issues with transmission temps in warmer weather? By issues, I mean going over the 200degree mark. I know some say its ok, but I didn't much care for it, so I put an additional cooler in our 1500, which helped tremendously. I ask mostly because the 2500's appear to have the exact same tranny cooler in them.
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Old 12-09-2014, 07:44 PM   #50
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The highest tranny temp I have seen, was right at the 200 degree mark. That was at the top of a 4 mile mountain climb with ambient temps in the 80's. Other times it peaks at about 180 and on flat ground typically runs at 165 degrees. My cooling system is stock.
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