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Old 11-10-2014, 08:20 PM
My Jeep: 2008 3.6L JK
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Pick my rear end (SFW)

After seeing copper brown, I think I am about to pull the trigger on a JKUR, auto trans. Trying to decide between the 3.73's and the 4.10's.

4.10 plusses: better acceleration, better for towing, better if you put big tires on

3.73 plusses: better milage, lower sticker price

First, am I missing anything? Second, I may not end up towing anything, and my planned build has either stock or (at most) 33" tires. So it pretty much comes down to this--Is the acceleration better (sportier) enough to make up for the purchase and ongoing costs?

(I get everyone has a different budget--this choice is not a budget buster, but I don't like throwing away money either.)

I know if there is ANY CHANCE I will go bigger than 33's to get the 4.10s. Looking for other arguments.

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Old 11-11-2014, 06:17 PM
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Re: Pick my rear end (SFW)

I went with 4.10's in my '07 sport auto and '12 rubicon auto. Just ordered and waiting on a '15 rubicon hard rock auto. All unlimited. Hills, family size (weight & gear), and even windy conditions pluses for the 4.10's. But it was more comfortable cruising at about 65 on the interstate, so that may be a minus for ya. Didn't bother me any. Plenty of times motored along faster than I should've no problem at all. Just a little noisier and less fuel efficient. But we are driving bricks!

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Old 11-12-2014, 12:58 PM
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You've pretty much identified all the pros and cons. I went with 4.10s because I planned to go with a larger tire when mine wear out, originally thinking 35s. I'm really liking the Jeep after having installed just a leveling kit so maybe 33s or 34s instead someday. The way the stock MTs are wearing, I'll have plenty of time to decide.

Jeep drives great with stock tires and 4.10s. More acceleration than I've used actually. At 70 on the freeway the revs seem a little higher than I'd like but at 70, there is so much else affecting the ride that RPMs is the last of my worries. Wind, crappy roads vs Rubicon suspension, mud tires...

The only other consideration I can think of is if you sold it private party, there might be more demand for it if it has 4.10s.

See if you can drive one of each and see if the 3.73s feel doggy to you.
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