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Old 07-19-2012, 10:39 PM
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Swap 3.73 for 4.10?

Having a hard time finding JKU's with 5 sp auto and 4.10's. Lots of 3.73's, so how difficult would a swap be to the 4.10, and what would it cost me?
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Old 07-19-2012, 10:43 PM   #2
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For the right price, extremely ready. What are you trying to do? Just curious. If swapping why stop at 4.10¿

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Old 07-19-2012, 10:48 PM   #3
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Not really worth the cost for that small a change, IMO. But that's just me.

A gear change (regardless of the #...3.73-4.10; 3.73-4.88, etc) is gonna run you $1500-$2K, give or take.

Generally, a gear change will most benefit a pre '12 (Jeeps w/the 3.8L engine), and are generally done along with a change in tire size.

For the Pentastar Jeeps, the only reason you should be thinking of a gear change if you've already got 3.73 gears is if you decide to run 35" tires. Even then I'd advise you to put the 35's on and drive it, to see whether or not it would be worth it to you.
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Old 07-19-2012, 10:58 PM
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Quote:
Originally Posted by GonzoBobH View Post
For the right price, extremely ready. What are you trying to do? Just curious. If swapping why stop at 4.10¿
I test drove a 3.73 JKU-Altitude then the JKUR with 4.10. Seemed a lot perkier. Maybe just my imagination, but it sold me on the lower rear end and the reason I opted for the Rubi instead of a Sahara. I probably won't really need the Rubicons off-road capabillities, so I'm just getting it for the gears. But, if I can get a Sahara and put the 4.10 rear in it, maybe that's the ticket. 4.88 or lower would kill mileage on the hwy, wouldn't it?
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Old 07-20-2012, 12:02 AM   #5
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4.88 or lower would kill mileage on the hwy, wouldn't it?
Depends on what size tires you end up with. In that scenario taller tires would actually help with highway mileage.

I'm on 35's with 4.10 gears in a Rubicon and I'm averaging 15.5 - 16mpg.
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Old 07-20-2012, 12:13 AM   #6
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My 33s are getting 16.2 mpg rather consistently. Ignore my earlier posts where I said I was driving so mellow and civilized... I am back to driving like I used to... Crazy, but not insane. Haha. Fyi.

Cheers.
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Old 07-20-2012, 06:31 AM   #7
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what are you looking to run? 2012, 3.73 and 35s.. never felt like I need to regear. the jeep still performs..
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Old 07-20-2012, 06:50 AM   #8
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what are you looking to run? 2012, 3.73 and 35s.. never felt like I need to regear. the jeep still performs..
Hearing that makes me feel good about my decision to run 315/70/17's on my 3.73 gears. I was a little nervous to go with anything bigger than a 33" but figured what the hell. Hope this works out as good for me as it did for you.
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Old 07-20-2012, 06:54 AM   #9
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You're talking $1,300 for 100ish RPM. A terrible deal in my opinion. You won't even notice the change.

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