What gear size are you running?

[Blue J]

I was all set on 5.13's for my JKU but I keep reading that they are prone to breakage. I am currently runnin' 35's and may head up to 37's at the next tire purchase. Any advice from the brain trust?

[clark123456]

I was all set on 5.13's for my JKU but I keep reading that they are prone to breakage. I am currently runnin' 35's and may head up to 37's at the next tire purchase. Any advice from the brain trust?

I ran 4.88s in my D30 and Ford 8.8.  I now have 5.13 in the prorock 44 and 60.  I imagine the pinion looks like a small q-tip on the PR44...but so damn sweet while it is working.  I'm running 38" BFG stickies, but I am pretty light on the throttle and I don't 'make it or break it'.  I am looking to go PR60 up front eventually.

[Krawler00]

Well, this debate has been going on for years. I own a TJ and have run 4.88s on my old 30/35 combo with no issues. I now run 4.88s on my waggy 44 and scout 44 rear with no issues on 35's. If you are a heavy footed driver I would opt for the bigger pinion option. But with the lack of torque in the JK motors you would probably be fine on 5.13s and 37's. I think a few guys run that same setup. Tony, Bobby?

[cru9]

I will say if your going to 37's with the stock Dana 30/44 or even 44/44 you need to do a lot more to axles before gears. Trusses, C gussets, chromoly shafts. I am still running 3.73 gears because it's a bigger pinion and thicker metal on Ring Gear. When I go to bigger axles I will go 5.38 gears. I don't heavy foot the skinny pedal and also my Jeep isn't a daily driver but I don't have any complaints on driving it. Also with 37's be ready to buy Hydro Assist steering.

[DOUG]

I've been running 5.38's for years in 2 JK's and never had an issue with 37's or 40's when they were on.

[cru9]

With a Dana 30 5.13 is the max

[tjsahara00]

So a JK 30 can hold 5:13's?

I ran 4:56 in my TJ 30 and super 35 with 35'' tires
Now I run 5:13 in Rubi 44's with 37'' tires

[kvom]

In a previous Jeep I had 5.13s in Waggy D44 axles on 37s.  Never broke any of the driveline, but it had a 2.5L.

[kent10sne1]

I have 5.13 on my front and it's a d30. No issues yet

[Blue J]

The current plan is to sleeve the front, truss the back, add Yukon Co mo axles, i already have C's and recently New ball Joints Thanks to Allsouth/Danny
Then regear (Yukon)and get ARB compressor/yukon Lockers front and rear....oh and get a beefy crossmember.....after that Fenders and maybe different sliders and then Steering assist when I get to 37's

I just want to make sure the 5.13's will hold up

[cru9]

I would truss the front before doing sleeves. A lot stronger.

[Blue J]

@PHANTOM  recommended a Sleeve, since the axle would be apart anyways...I am not sure which is best or strongest.