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Old 11-04-2015, 12:51 PM   #11
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The Yukon is very capable but to tow I'd change that 3.08 gear to at least a 3.73. A 4.10 would be awesome but fuel mileage would suck!. I tow with a suburban old school 350 engine with 3.73 gear. It's a good compromise for both power and mileage. I think the 3.08 is gonna struggle with 5k lbs.
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Old 11-04-2015, 12:52 PM   #12
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Ok. I will check into that. Unfortunately it's 4 x 4 so gotta do both ends
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Old 11-04-2015, 01:02 PM   #13
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I can't speak for 4wd. But my pinion bearing just went out a few months ago. I looked at upgrading to the 4.10 while I was in it if the old gear was bad. Ended up it was Just the bearing and I kept the original gear. Anyway a new 4.10 was right at 200 bucks for the parts, with me doing the labor. Gears are easy fairly cheap labor, pinion bearing is labor intensive and time consuming if you hire it out.
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Old 11-04-2015, 02:49 PM   #14
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Be careful, changing gears will not increase your carrying capacity. Carrying is just as important as pulling.
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Old 11-05-2015, 07:50 AM   #15
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Do a google search for Randys ring and pinion.. he is an expert at swapping out dif's well worth the phone call.
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Old 11-05-2015, 07:58 AM   #16
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I changed from 3.55 to 4.53:1 gears on my 4WD the cost was $400 labor on each differential and $400 for parts each end. So about $1000 which is cheaper then a new vehicle. I love how my truck pulls now with the new gearing.
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Old 11-05-2015, 10:25 AM   #17
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You guys gotta keep in mind that his 2011 has a 6 speed transmission - he would not want to go too deep on the gears. My Silverado with a trailer package has 3.42 gears and it is perfect in my opinion. The ratios in the 6 speed are different than the previous generation 4 speeds.
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Old 11-05-2015, 10:54 AM   #18
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Take a look at this info...

Here are the gear ratios for the 6L80E:
1st - 4.027
2nd - 2.364
3rd - 1.532
4th - 1.152
5th - 0.852
6th - 0.667

Compared to the 4L60E:
1st - 3.059
2nd - 1.625
3rd - 1.000
4th - 0.696

Now look at this final drive ratio comparison I threw together for his current gears…

6L80E with 3.08 gears:
1st – 12.4
2nd – 7.28
3rd – 4.72
4th – 3.55
5th – 2.62
6th – 2.05

Compared to 4L60E with 3.73 gears:
1st – 11.4
2nd – 6.06
3rd – 3.73
4th – 2.6

So, he is actually better off than I was last year with my 06 Tahoe with 3.73 gears... 6th gear might not see a lot of use though...
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Old 11-08-2015, 07:37 PM   #19
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Nice figurin' gone. Thanks very much. I too also agree that the 6speed tranny and computer makes a "gear swap" something of yesteryear. Basically any GM after 2007 will never have its gears swapped once the owner realizes what the shop needs to do.

Gone are the days when 4x4 Chevys were sold with solid front axles and manual gear boxes. Maybe the new fords can still be "swapped" but I'm not a ford guy, so I have no idea. But every time I see on the forum "you should look into a gear swap" I chuckle.
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Old 11-08-2015, 08:16 PM   #20
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Well all this info is making me feel better. I will just be careful until I see how things are going to go. Can't wait to get it next Saturday.
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