My head hurts after reading all this.

All I know is my 37s and 5.38s have way more power than my 37s and 5.13s. I am so glad I went to the 5.38s. It down shifts less on hills and pulls much better. Ive only had the 5.38s for a few weeks, so Im not sure how the mileage has been affected. Mine is an auto. I couldnt be more happy with the 5.38s, unless I had a 6.4 hemi and that wont happen until the Jeep is paid off.

 

I find this thread to be extremely amusing, so I thought I would bring it back top.

 

Was entertained by the the amusing pokes back & forth, but more so liked the back ups being presented in the debate. Have a 2010 JKU Rubi factory loaded with no mods that I'm trading for a 2012 JKU that's on order. Do plan on on a small lift & bigger tires so have followed this thread with interest. Even with stock tires the 2010 with auto & 410 gears does to much shifting for my taste at freeway speed, but fine else wise. The big differences with the new motor & trans in the 2012 has been a challenge to sort out whats best for me between the 373 & the 410 now. With the very slick Wyoming winter roads run the 32 inch 255/75/17 blizzaks in the winter & will continue to do so with the new 2012. Want only a minimal lift to run 33 km2 255/80/17 or 285/70/17 in the summer & to help some over the rocks, so to stay in what I think is the sweet spot for me from many hours of reading threads here have changed my order from 410 to 373.

 

I knew someone would do this!

 

I can take pics too. Looks like similar rpm/mph to the previously posted pic. Difference is, this is with 5.38 gears and 315/70-17 tires. Without the gears, my rpm's would not be enough to maintain any kind of speed.

 

Wish I had time to respond to this. There needs to be clarity on torque, and the rate that torque is applied (horsepower).

Especially like the putzing around at 50mph. Truly comical and I've already spoke of the exponentially increasing drag with speed.

 

Of course you don't have time. Why? Because my point has been proven and you just don't like it.

And still unwilling to respond to the previous absurd statement that does wonders for credibility.

 

Jim, again, I am not suggesting what you imply. I am suggesting that a modded 3.8 can turn 37s at normal driving speeds with 4.88 gears. The chart and torque numbers supplied by Planman support this but too many hear want to ignore those figures. Why? Because it has become gospel that with 37s you need 5.13s or lower gears that has been repeated so many times it has become "fact", even though the numbers (math and science) disprove that.

Oh, and btw, you're rpm is several hundred rpm higher than what I posted. Yours also is lifted, further increasing drag, has increased rolling resistance r/t heavier tires and increased drag, and also note that your ECO indicator is not on while mine is, so simply.... that dog don't hunt. Totally different comparison. Please return to the area where I was discussing 1900-2200 rpm as optimal for cruising.

 

As Jpop has stated, it's not always one size fits all. I tend to drive like you describe so I don't feel I need 5.38s and 33s like others here do. I had 5.13s and 37s on my 08 and am saying 4.88s would have been adequate for me, also allowing better mileage. The torque figures supplied by Planman support this. I just don't understand how some poeple find that so difficult to understand.

So, it's basically what works for you.