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Old 02-04-2015, 07:31 PM
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rubicon with 373 gears

who is driving this set up it will be an automatic. have you put larger tires on it? how do you like it?

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Old 02-04-2015, 08:08 PM   #2
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I have that setup with stock tires. It's great, pretty snappy, and with the 4:1 low you really don't need more gear off-road. Still, if i had it to do over again, I would get the 4.10's. I just don't think the gas mileage penalty is much at all over the 3.73's and you get about 10% more torque in first gear. After that the shift points come into play and stuff starts getting complicated, but off the line a 4.10 geared Wrangler should be noticeably peppier than an equivalent 3.73 geared Wrangler.

Of interest:


According to Roger Clark, senior manager for General Motors Integration and Fuel Economy Learning Vehicles Program (FELVP), which handles EPA testing of all GM trucks and SUVs, "fuel economy may not change at all by going to an optional axle ratio.

“The typical combined fuel economy impact, based on EPA lab test conditions, is about .4mpg to .6mpg between the base gear ratio and the lowest (4.10) offered. That change is linear. Equipping a truck or SUV with a 3.73 gear ratio, for instance, would affect combined fuel economy by less than a quarter-mile-per-gallon.”

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Old 02-04-2015, 08:25 PM   #3
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I'm running 373s in my rubi. At the time I orderd it 410 was a $500 option. Knowing that eventually I would be upgrading to 37" tires I decided to pass on 410 option. Currently I'm running 35" tire with a 20" wheel and they are heavy. Around town this gearing combo is fine. On the highway (70-75mph) however with a head wind does force the jeep to float between 4th and 5th gear.
'14 JKRX - Triple White, Auto, BestopNX Twill, 430N, Auto A/C. Mods: 3.5” MetalCloak Game Changer Lift, Fox Shocks 2.0, 37” Mickey Thomptson ATZ’s wrapped on Fuel wheels with OMF beadlock conversion, AEV Rear Tire Carrier, JWS8700Evo Headlights and Tails, SmittyBilt XRC Mod Front bumper w/Stinger,Warn Zeon 10S, ARB Duel compressor, DynoMax Exhaust and Surprise Straps. And a 04 TJ.
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Old 02-04-2015, 08:38 PM   #4

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3.73 should be fine with a 33ish tire.
2014 JKR Granite Crystal, 5.13 Auto: RK X Factor 2.5 Inch Lift, Artec Front and Rear Truss, Artec Rear LCA Mounts/Skids, Poison Spyder HD Crossmember, Rock Hard Gas/TC/Evap/Oil Skids, Rough Country Diff Sliders, Nitto Trail Grapplers 37x12.5x17, Pro Comp 97 Series Wheels, Synergy Weld On Rear Trackbar Bracket, PSC Hydroassist, T6 Aluminum Tie Rod, G2 Gold Chromoly Axle Shaft/RCV front axle shaft, Dynatrac Ball Joints, 1310 driveshafts, Artec Rear Upper CA Mounts, Warn VR8000.
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Old 02-04-2015, 08:53 PM   #5
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Running a 2015 JKUR with 4:10's and auto trans. After 20 tanks of fuel driving at 70 MPH I'm averaging 17.5 MPG, pure stock. Not bad, and if I go to larger tires with the 4:10's I'll still have plenty of guts and may improve my mileage. Happy with this set up as it gives me options.
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Old 02-04-2015, 09:02 PM   #6
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Buy the 4.10s, swap me out your new axles for $2500 plus my 3.73s d30/44(8k miles). You just saved 2500 on the price of your jeep. *thumbsup* everyone is happy. LOL except you got a D30 up front **thumbsdown**
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Old 02-04-2015, 09:24 PM   #7
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I have the stock tires with 3.73 gears, and works fine.
2014 JKUR
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Old 02-04-2015, 09:47 PM   #8
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Originally Posted by wanderer View Post
who is driving this set up it will be an automatic. have you put larger tires on it? how do you like it?
I have set up with 35s. No issues. On road or off road
2014 Rubicon. Billet silver
3.5 aev lift, aev front bumper, aev rear bumper with tire carrier, aev hood, AMP power step, MyGig back up, Warren Zeon 8 k winch, 35" Duratrac tires, Aev black pinters wheels, spod, IPF lights, Recon LEDs, rigid back up light, hilwing rear tracking bar
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Old 02-04-2015, 09:51 PM   #9
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I'm running 3.73 axles with 33x12.5, automatic, diesel

You will notice the bigger tires, but it's ok. With the bigger tires you won't get any wheel spin on wet roads. The stock tires were spinning like hell on wet roads and the esp was comming up all the time.
- Andre

2013 Jeep JK Rubicon CRD, AEV 2.5, correction brackets, 33x12.5 R17
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Old 02-05-2015, 03:41 PM   #10
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I ordered mine with 3.73's. For what I do (mostly flat highway travel and light off roading), the 3.73's are just fine. I don't really plan on any lifts, etc., not even after it is retired to play vehicle only. I may go to a pizza cutter 33" in the future but not sure. For the type of terrain I am in (Central MS) the stock tires and 3.73's are fine. I can see where the 4.10's would be peppier without very much of a gas mileage penalty until you get up to higher highway speeds - then it's pretty much gonna suck anyway. I'm averaging about 18.5-19.5 mpg on mostly flat highway driving with 85% of my travel on highway speeds up to 55 mph, and 15% varying up to 45 mph and city driving. I don't think my setup will necessarily be the better option for you, but works for me just fine. If I lived in a hilly or mountainous region, then I'd go with 4.10's and never look back, or if I planned on 35's.
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Old 02-05-2015, 04:00 PM   #11
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Originally Posted by wanderer View Post
who is driving this set up it will be an automatic. have you put larger tires on it? how do you like it?
I have 3.73's with 35" tires. It works just fine but under moderate acceleration, it can rev like a banshee. I'll either drop back down to 33's (hate to give up clearance) or upgrade to 4.10's instead.

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