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Old 03-27-2012, 06:06 PM   #1
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Question 3.73 or 4.10 1st Post lol

Ok,
Very big Noob here when it comes to Jeeps.

Im looking at 2012 JKUR Crush,
Looking at doing Some Off-roading...have a few buddies with jeeps, the last one just bought a JKU WC Artic edition. Off roading mostly Mud/wood trails......no Rock crawling....This Jeep will be my DD, will use it for everthing family wise ( Kids to Hockey/Shopping)....Ok enough rambling...

But I have a few Probs....
1. Can a 3.73 do what im looking for..2.5 inch Lift prob Teraflex with 33" Goodyear DuraTracs 33x12.5x8 and maybe 35's in the future.
......Or should i get the 4.10 and loose a little MPG...is there any real difference at this stage or is the 4.10 overkill??
2. 15's or 17's......with what i briefly discused in the above Paras is there any real Pros or Cons with 15's or 17's...besides more money in my pocket ??.

I hope atleast some of this makes sense to you true wheelers......I just want to build a sweet jeep and hopefully turn it into a kool hobbie.

Any help on this will be sweet thx.

JaVa

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Old 03-27-2012, 06:13 PM   #2
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Originally Posted by JaVa Crush View Post
Ok,
Very big Noob here when it comes to Jeeps.

Im looking at 2012 JKUR Crush,
Looking at doing Some Off-roading...have a few buddies with jeeps, the last one just bought a JKU WC Artic edition. Off roading mostly Mud/wood trails......no Rock crawling....This Jeep will be my DD, will use it for everthing family wise ( Kids to Hockey/Shopping)....Ok enough rambling...

But I have a few Probs....
1. Can a 3.73 do what im looking for..2.5 inch Lift prob Teraflex with 33" Goodyear DuraTracs 33x12.5x8 and maybe 35's in the future.
......Or should i get the 4.10 and loose a little MPG...is there any real difference at this stage or is the 4.10 overkill??
2. 15's or 17's......with what i briefly discused in the above Paras is there any real Pros or Cons with 15's or 17's...besides more money in my pocket ??.

I hope atleast some of this makes sense to you true wheelers......I just want to build a sweet jeep and hopefully turn it into a kool hobbie.

Any help on this will be sweet thx.

JaVa
4.10's, if there's even a remote possibility you'll go with 35" tires.

Aside from saving you $$ on tires, the smaller rims will save weight and give you a bigger contact patch.

If you're REALLY concerned with mileage, keep your Jeep stock.

Welcome to WF.

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Old 03-27-2012, 06:18 PM   #3
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welcome to wf and I'll go ahead and say it...congrats on the future jeep!

and I'd trust kb's recommendation to go with the 4.10's since you MAY move up to 35's.
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Old 03-27-2012, 06:20 PM   #4
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Awesome thx for the quick reply.

Aside from maybe getting the 35's would a 3.73 do the job ??

Also When it comes to towing...pop-up trailer 2000lbs plus gear/family. would a 4.10 Auto make and Difference compared to a 3.73 Auto. Or would they do roughly the same ?

Again thx for the help.


JaVa
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Old 03-27-2012, 06:25 PM   #5
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Ditto, 4.10, mileage difference is negligible, and you'll like the drive better. You can compensate by driving slower .
Regearing will cost you $1500 at least, if you need it. That would take a whole lot of gallons of gas to justify. What, 375 gallons at $4/gal. And with say 17mpg vs 17.5mpg on a regular average, 25 gal fill up, that's 12.5 mile difference per tank, less than 1 gal. That would be about 0.7 gal per fill up. 375/0.7 = 535 fill ups. Average 1 fill up per week, 52 weeks per year, so that's 10.3 years.
So, if you decide to re-gear before 10.3 years, you'll end up taking a loss by not paying for the 4.10's up front.
So, there's some wacky logic for you, take it, and run with it! Don't bother even trying to verify it, just RUN WITH IT!
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Old 03-27-2012, 06:28 PM   #6
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What, Towing!?! This is new information... yes, 4.10's, must! You'll probably even save yourself some mpg's while towing by going with the 4.10's.

Quote:
Originally Posted by JaVa Crush View Post
Awesome thx for the quick reply.

Aside from maybe getting the 35's would a 3.73 do the job ??

Also When it comes to towing...pop-up trailer 2000lbs plus gear/family. would a 4.10 Auto make and Difference compared to a 3.73 Auto. Or would they do roughly the same ?

Again thx for the help.


JaVa
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* 2012 JKU Rubicon Deep Cherry Red - 4.10 Gears - AEV 4.5" DualSport RS Suspension - 35x12.5 BFG KM2's on Pro Comp 8069 Wheels - ACE Rock Sliders - Gobi Stealth Rack - Tom Wood's shafts - M.O.R.E Dual Battery Tray with 2 Optima Yellow Tops, Smart Isolated.
* Military M416 Trailer in Olive Drab - Custom Aluminum Lid - Mombasa RTT on lid - ARB Awning w/privacy room on custom low sitting extension arms - Custom Rear Swing-out Tire Carrier - Custom Fuel Carrier on Tongue...
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Old 03-27-2012, 06:37 PM   #7
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Originally Posted by JaVa Crush View Post
Awesome thx for the quick reply.

Aside from maybe getting the 35's would a 3.73 do the job ??

Also When it comes to towing...pop-up trailer 2000lbs plus gear/family. would a 4.10 Auto make and Difference compared to a 3.73 Auto. Or would they do roughly the same ?
Again thx for the help.
JaVa
The 3.73's would be fine for 33's. However, when towing you'd get performance similar to if you were running 35's. It wouldn't be horrible, but you'd notice a marked problem going up hills and trying to pass slower traffic in high gear on freeways. With an auto tranny, you might have to turn off the OD to make it acceptable, and keep the tranny from hunting and pecking for the proper gear.

With a manual, obviously, you'd probably just wanna avoid 6th gear. My thinking is that the 4.10 gears are a minimal cost from the factory, but quite a significant expense if you have it done after you buy your Jeep.

If I walked into a dealership tomorrow and bought a new Jeep, I'd opt for the lowest gears offered.

There are people on here who'll argue with that, and tell you the 3.73's on the Pentastar are fine. Pretty much up to you.
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Old 03-27-2012, 07:49 PM   #8
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For 2012, I found out when ordering my JKUR, that just shipped yesterday BTW, that the 4:10 gears are a Zero dollar item. No charge. I got them and I can't imagine that it was the wrong decision under any circumstance. The Jeep Wrangler is not the most aero efficient vehicle so some gearing can't hurt.
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Old 03-27-2012, 09:41 PM   #9
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Quote:
Originally Posted by kbwwolf View Post
4.10's, if there's even a remote possibility you'll go with 35" tires.

Aside from saving you $$ on tires, the smaller rims will save weight and give you a bigger contact patch.

If you're REALLY concerned with mileage, keep your Jeep stock.

Welcome to WF.
x2... if i had a choice.. no question i would've went with a 4.10! stock rubi wheels and tires, 33s, 35s... whatever and get rid of the 17s! sooner the better, you'll recoup more money that way.. you'll find plenty of info on 15" and 16" wheel choices with little weight change and your wallet will thank you

welcome to the forum! enjoy your new JKU.
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Old 03-27-2012, 09:45 PM   #10
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Thx KB,

Very Good Info Supplied...Been thinking hard on this one I'm leaning towards the 4.10 Just because i think it will all around, out shine the 3.73 ( Towing/Passing, Mud/Trails, Lift kit and tires 33's or 35's). at the cost of 1-3 MPG.
Now all i gotta do is figure out do i want the JKUR Crush.... Full body Orange or Black fenders/Top to break it up....lol

JaVa
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Old 03-27-2012, 09:54 PM   #11
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Originally Posted by kbwwolf View Post
The 3.73's would be fine for 33's. However, when towing you'd get performance similar to if you were running 35's. It wouldn't be horrible, but you'd notice a marked problem going up hills and trying to pass slower traffic in high gear on freeways. With an auto tranny, you might have to turn off the OD to make it acceptable, and keep the tranny from hunting and pecking for the proper gear.

With a manual, obviously, you'd probably just wanna avoid 6th gear. My thinking is that the 4.10 gears are a minimal cost from the factory, but quite a significant expense if you have it done after you buy your Jeep.

If I walked into a dealership tomorrow and bought a new Jeep, I'd opt for the lowest gears offered.

There are people on here who'll argue with that, and tell you the 3.73's on the Pentastar are fine. Pretty much up to you.

Yup. I think they're ok for now and I know MarineHawk does too.

You just lose a little power in a few places.

That being said, I'm debating a regear at some point. Maybe whenever I decide to get ProRocks

kbwwolf is right on the money, get the lowest gears you can; it'll directly apply more power at the wheels
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Old 03-27-2012, 10:05 PM   #12
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Thx KB,

Very Good Info Supplied...Been thinking hard on this one I'm leaning towards the 4.10 Just because i think it will all around, out shine the 3.73 ( Towing/Passing, Mud/Trails, Lift kit and tires 33's or 35's). at the cost of 1-3 MPG.
Now all i gotta do is figure out do i want the JKUR Crush.... Full body Orange or Black fenders/Top to break it up....lol

JaVa
The 4.1's does not "cost you 1-3 MPG" It's less than 1 mpg.
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Old 03-27-2012, 10:10 PM   #13
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The 4.1's does not "cost you 1-3 MPG" It's less than 1 mpg.
Less then 1 MPG ....would be Stellar/Huge .....If True the 4.10 Is For sure going to be my pick
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Old 03-27-2012, 10:13 PM   #14
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Just get 4.1's. No one ever, EVER says "I should have gotten 3.73 instead".

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