What do I need to replace them with? I keep breaking my front u joints and I bent my rear axle shaft. Running 37s on 2010 rubicon with 5:13 gears

 

i would say something stronger.

 

RCV's for the front is a pretty good choice.

 

Or a smaller skinny pedal so it's harder for you to use.
That is what gets people in trouble most of the time. Or at least it does for me.

 

x2 All the cool gear in the world wont make up for skill!

 

Like I have said before on here running big tires, big gears and lockers if you don't upgrade to the dana 60s it will just keep on happening. They don't sell jeeps with big tires because the driveline isn't strong enough to handle it. This isn't something new. It has always been this way. If you want to have great traction and big tires and big gears you have do the upgrade, that is why there are complete axle sets that you can buy and put under your JK.

 

37's are a lot of tire. if you can get yourself to go easier on the skinny pedal, it'll help out a lot. also, if you're still running factory front shafts, replace them with a set of chromoly shafts as they will come with full circle clips as opposed to c-clips. aside from that, you might want to consider saving up for a dana 60. as far as the rear goes, again, try going easier on the gas and or save up for a 60.

 

If you "broke" an axle shaft and a u-joint, then cromo shafts and/or the RCV cromo shafts may be the answer for you.

If you "keep breaking" axle shafts and u-joints, then I'd say that Dana 60's are probably the answer.

Those two statements assume that you're going ot keep applying the same amount of skinny pedal. The least expensive solution is (of course) don't beat on your rig quite so hard.