I just got a set of 37s for my 2012 2 door sport and was gonna run a 2 inch lift...was wondering if I would need to upgrade the driveshafts or will the stock ones hold up

 

Youll need more than 2 inches of lift

 

Not true. With appropriate trimming or the rear wheel well's front and rear pinch seams, flat fenders, and appropriately adjusted bump stops, you can do it and it will work well. A local guy runs 2" synergy coils with 37 MTR-k's, and runs it hard.

The factory driveshafts will work.

You won't have enough lift to endanger the joints during normal operation, but depending on shock length things could get interesting under droop. Will take cycling the suspension to be sure.

 

Vengeance is running only 2 inches over stock and 37s with 14inch coilovers

 

I'm running a 3" lift, teraflex, for a four door on my two door putting me at 3.25" lift. I also have the adjustable control arms pushing my tires back apart where they ae suppose to be. I run a 35" tire and I have no fenders. I completely stuff the the 35" at full flex. I'd love some 37" but, it'd be impractical as it would rub, plus, I have a lot of fun at the 35" mark. If I would shoot for anyhing more I'd want to upgrade my Rubi axles, go 6" LCG long arm, and run 40's.
I think the 37" will fit your Jeep with the 2". I also think your driveshafts will survive, for a little while. I think i'd be impractical and your be rubbing all the time. If your' just a DD- Daily driver- then go for it! If you plan on wheeling it, save up some more money!
It's your Jeep however and If you want to only use a 2", go for it! Body lifts get a bad rap but you may think of doing a 1" body lift. I'll allow you a little more without doing anyomore damage to your driveline.
There plenty of options out there. Just do what you think is best for you.

 

I say they will hold up for a while until you save up for a new one or until this one fails. My 08 x had a tear on the boot and ran it like that for a couple of months on trails like ones in corral canyon and big bear nothing crazy maybe twice a month.

 

Buy some rugged ridge or bushwhacker flat fender flares. A two inch after that will be adequate. I can only assume some scrub on the back wheels at full flex in the top of the fender well. I have 33 inch no lift with RR flat flares. It just barely touches in the back if I flex out super hard. I would also recommend wheel spacers or more BS on a new set of rims. Wheel spacers are also NOT dangerous. The flat flares also give a 2 or 3 inch lift appearance because if the raised fender line. Also be sure to buy the inside liner for the fenders. Cutting the stock ones is a pain in the ass.

 

Really not sure if you're suggesting he goes for it or not here...

Not sure what you're saying with using rear adjustable control arms to put the axle where it should be? If you have used them to center the rear axle at ride height, yes you will have moved the tire away from the front-rear pinch seam, however with lager rubber (37+) you run the risk of pushing the tire int to the rear-rear pinch seam. Ideally, you should center the axle making sure the bumpstops and bumpstop pad are concentric at full compression, an trim both front-rear and rear-rear pinch seams accordingly.

If you rub, you address your bumpstop lengths accordingly, or trim away necessary sheet metal. Furthermore bumpstops are not just to prevent rubbing but stop you from over compressing shocks, which should be taken into account when setting length.

6" of lift isn't LCG (low center of gravity). And 40's can very successfully be run on 4.5" of lift with proper suspension setup. I would not run a teraflex long arm purely due to the design of the rear arms. The rear upper arm is significantly shorter than the rear lower, which will cause way too much change in pinion angle over suspension travel. I think teraflex is a great standup company, But thats just my opinion about the design.

As I stated in my first post he could run a very successful dual purpose dd and wheeling rig with 2" of lift if he takes the time to PROPERLY set up his suspension. And at that shallow of a lift height he will save good money.

I would advise against body lifts over a proper coil, which will allow longer free lengths, or more suspension travel without unseating a spring.

Hope that helps, cheers.

 

Vengeance is also stretched.

 

So get the rock krawler 2.5 long arm stretch and flat flares. There is your 37s