4.10 Gear in Yukon?

[Carrotop79]

Okay, I realize this topic has been beat to death...but not for the Tahoe/Yukon folks. When I tow, the I can't seem to break 60 mph without going into 2nd. I tow a 26' travel trailer with my Yukon 5 times a year. The trailer weighs 5000lbs. I tow various other items but with a utility trailer. I would like to upgrade my 3.73's to 4.10's very soon. Our trucks (as you know) ride very quiet at highway speeds due to RPM. How much RPM will I gain with the 4.10's? Also, in your opinion, is it a worth while mod? Yes I will be tuning with Nelson if I do the swap. My next post will be about beefing up the 4L60e. But for right now I am just trying to justify the 4.10's and tuning. Thanks all.

[Blackdog]

<div class='quotetop'>QUOTE(Carrotop79 &#064; Feb 19 2007, 09&#58;43 AM) [snapback]83772[/snapback]</div>

Okay, I realize this topic has been beat to death...but not for the Tahoe/Yukon folks. When I tow, the I can&#39;t seem to break 60 mph without going into 2nd. I tow a 26&#39; travel trailer with my Yukon 5 times a year. The trailer weighs 5000lbs. I tow various other items but with a utility trailer. I would like to upgrade my 3.73&#39;s to 4.10&#39;s very soon. Our trucks (as you know) ride very quiet at highway speeds due to RPM. How much RPM will I gain with the 4.10&#39;s? Also, in your opinion, is it a worth while mod? Yes I will be tuning with Nelson if I do the swap. My next post will be about beefing up the 4L60e. But for right now I am just trying to justify the 4.10&#39;s and tuning. Thanks all.
[/b]

Upgrade it&#33; My 4.10&#39;s were a good improvement. Out the whole harder&#33; I can pull much better too. What size rims and tires makes a factor too. I am now swapping too 4.56&#39;s due to my 22&#39;s and bigger tire combination.

[1BADC10]

hmm... what type of gas mileage are you getting w/o towing w/ 3.73s? Just curious b/c w/ 3.42s in my &#39;02, I get a max of 16 hwy (which happens to be the EPA-rated max). I drive my Kon on a daily 100-mile commute to & from work. I did notice that my pickup w/ 4.10s & a 5.3L/4L60E combo yielded 19mpg (w/o a working lockup).

[Red03SilSS]

w my 4:10s and AWD cruising at 70 mph I can average around 2300 RPMs and 18 MPG. How? I dont know.

[Carrotop79]

I am not worried about my MPG&#39;s that much. I am mainly talking about cabin noise from the change in change in RPM and also the in and out of lockup and/or downshifting associated with the 3.73&#39;s. I will drive it today and get back with my RPM numbers, but I think at 70 mph, I am about 1800. (approx). That is without towing.

[Carrotop79]

Okay, at 70 mph I am turning just shy of 2000 RPM. What can I expect from the 4.10&#39;s? Also, does the 87-89 tune from Nelson remove TM or do you have to specify how much to remove?

[Hit Man X]

Few hundred more.

[gearheadnate]

Well as far as the cabin noise level it depends on what kind of exhaust you have. If its stock you won&#39;t hardly notice. Muffler type and tip size and positioning change things too. I have Flowmasters and they are very sensetive to rpm and load to how much noise.

[Carrotop79]

I am all stock in teh exhaust department. Too many to choose from. Trial and error on exhaust can be mega &#036;, so i will wait a little while longer after more research. I guess the decision has been made then...4.10&#39;s and a tune. Thanks all. I will post next week when I get all of that done.

Nice wheels gearhead, those are the ones I have. Do you know where to get the polished ones? (they look chrome)

[1BADC10]

<div class='quotetop'>QUOTE(Carrotop79 &#064; Feb 21 2007, 06&#58;31 PM) [snapback]84071[/snapback]</div>

Okay, at 70 mph I am turning just shy of 2000 RPM. What can I expect from the 4.10&#39;s? Also, does the 87-89 tune from Nelson remove TM or do you have to specify how much to remove?
[/b]

With 28" tall tires, 4.10s, stock 4L60E... my C10 was recently turning ~2500rpm at 70mph.

With 30" tall tires, 3.42s, stock 4L65E... my Kon turns 1800 - 1900 rpms at 70mph.

Gear sizes obviously affects revs... how much does tire size factor in (if any)?