I have a 2013 JKUR, 3.6 6sp 4.10 and there is no way I would run 37s with the stock axles.

I have 35s and with 4.10 the performance is just barely enough.

Before I run 37s I need 1350 Driveshaft, Prorock 44 or 60 axles and at least 4.88 gearing.

I saw many broken stock axles with 37 and even after they have been gusseted and sleeved.

 

On the flip side to that, I've run with many jeeps on 37s and D30 and D44s with 3.73s. We wheeled pretty hard in VA and they performed just fine. Is it ideal - probably not, but the JK can handle a lot...

 

To me, I think of it like the debate on a new driveshaft with lift kits above 3 inches. Put on 37s and go have fun. You may never have any problems, but don't be surprised if you break something. That is the only way you will know for sure if you have to upgrade.

Sent from my SAMSUNG-SGH-I317 using JK-Forum

 

Yes if you are willing to take any risk to break a drive shaft and maybe it could also take the transfer case or other components with it. But don't expect a tow truck to come in off road area.

As for running 37 with 3.73 and stock axles, yes it will work, you might be lucky for a long time but I know the stock axles are weak and the stock housing is flexing a lot when going over 35'' tires. Your gas mileage and performance will suffer with the stock gears.

 

You mean roadside assistance won't come get me?

 

ANY time you hit the trail, no matter what your setup is, you run the same risk. What people fail to understand is, most breaks happen due to the driver - not the vehicle... Your jeep doesn't know where it should and should not go or attempt, but the driver sure does ...

 

I have a 2013 6sp 2dr on 37"s. Plenty of power to cruise freeway speeds without downshifts. (And its hilly here). Plenty of power around town. I actually like the 37"s more than the 33"s I started with. Lower rpms at 70+ but still enough power. I average about 17.5 mpg, that's with steel beedlock rims.

 

After a couple days of driving I'm feeling the same

 

a 2 doors Jk should be less affected than a 4 doors.

There is also some differences in 37 tires size (true size measured).

BFG KM2, AT and Goodyear MT/R in 37x12.50R17 are a bit smaller than some others brand. They should fit better also if you don't want to do heavy trimming of your inner fenders and use reduced bumpstops.

 

Not sure where you heard mtrs run small but that's incorrect they run true to size.