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Old 07-20-2011, 01:24 AM   #1
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2010 Suburban w/3.08 diff...

I've added a transmission cooler and am thinking about upgrading the differential to the 3.73.

No AS as of yet but the wife has her eye on the new Eddie Bauer.

Basically, the Suburban is my daily driver and I don't want the gas milage hit of a 3/4 ton. This also makes me concerned with going all the way to a 4.10.

Is the 3.08 - 3.73 going to make a significant difference? What's the mileage hit that I'm looking at?
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Old 07-20-2011, 06:00 AM   #2
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Back in the 70's i towed a 29 ft Ambassador all over the US with a 454 powered half ton chev. with a 3.08 with no problems at all.
Probably numerically higher would be better but it is worth a try before you spend a lot of money changing gears
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Old 07-20-2011, 07:05 AM   #3
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I had an '08 1/2 ton pickup with the 5.3L engine, changed the gear from a 3.73 to a 4.10, and the fuel mileage was improved a little.

You didn't say, but assuming you have a 1/2 ton, the factory does not make a 4.10 gear for that rearend housing, only the 3.73. To get a 4.10 or better, you have to go to aftermarket gears. At least, that is what I found in '09.
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Old 07-20-2011, 08:08 AM   #4
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Quote:
Originally Posted by SteveH
...the factory does not make a 4.10 gear for that rearend housing, only the 3.73. To get a 4.10 or better, you have to go to aftermarket gears. At least, that is what I found in '09.
Or replace the entire rear axle assy. $$$ I did something similar about 20 years ago and bought a compete junkyard axle. I actually got better fuel economy towing. There was a slight penalty when running solo, but that may have been in part to the new found peppiness when the light turned green. ;-) That was also when cars were 99% nuts and bolts, so I had to only change the speedometer gear. Modern cars will likely require some reprogramming to the computer which shouldn't be too hard to get done.

Most of the current full size pickups/SUVs I'm familiar with come with a 3.73 axle as part of the towing package which often includes an upgrade to the engine cooling, and external engine oil cooler and an external tranny cooler and bigger sway bars. I tow with a EB Expedition 2WD with factory towing package and have been completely satisfied with it.

Depending on you existing equipment, you may be ahead to keep what you have as is and see how it goes with the trailer in tow. If an upgrade is needed, you might weigh the option of trading for a TV that is already equipped with those other sundry components.
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Old 07-20-2011, 08:18 AM   #5
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Generally speaking the half tons and three quarters get the same mileage if the drivetrains are the same. jim
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Old 07-20-2011, 08:50 AM   #6
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Oh yes, forgot about the reprogramming. If you get the gear changed at a dealer, about a $2500 job if memory serves me, that includes the reprogramming. If you get it done at an independent shop, you will need to buy a programmer to the tune of about $300.

And by the way, if anyone needs a programmer for a GM V8 truck, I have one I would like to sell cheap.
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Old 07-20-2011, 08:58 AM   #7
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I would try to go with the 4.10. I don't think the gas millage will get worse. I get 17 around town and 20 on the highway with my Sequoia with the 4.10. In fact it tows better than my friends 3/4 ton 05 suburban. Now it doesn't have the power since he has a 8.1 litter but the transmission is better up and down hill ( it doesn't shift as much) and I get better mpg He gets 10 I get 12. I did put air bags in the back so I don't have to crank the equalizer down so much and i rides better with them.
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Old 07-20-2011, 12:29 PM   #8
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Quote:
Originally Posted by SteveH View Post
I had an '08 1/2 ton pickup with the 5.3L engine, changed the gear from a 3.73 to a 4.10, and the fuel mileage was improved a little.

You didn't say, but assuming you have a 1/2 ton, the factory does not make a 4.10 gear for that rearend housing, only the 3.73. To get a 4.10 or better, you have to go to aftermarket gears. At least, that is what I found in '09.
You're correct, I have the 1/2 ton. I'm also pretty sure that you're right about there not being a 4.10 from the factory.
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Old 07-20-2011, 12:32 PM   #9
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Quote:
Originally Posted by YankeeDoodle View Post

Most of the current full size pickups/SUVs I'm familiar with come with a 3.73 axle as part of the towing package which often includes an upgrade to the engine cooling, and external engine oil cooler and an external tranny cooler and bigger sway bars.
The factory towing package includes an aux. engine oil cooler, aux. transmission fluid cooler, 3.42 rear end and 2 speed transfer case.

I've already added the transmission cooler and the two speed transfer case isn't really an issue.
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