Just wondering with a 2.5 lift on a 4dr, wanted to know if im better off leaving control arms stock or just doing upper adjustables only, or just doing lower adjustables only?

 

I have a Teraflex 2.5" Coil lift. I added Rock Krawler adjustable lower control arms and Rock Krawler adjustable track bar on the front. I also have exhaust spacers to keep from tearing the boot on my driveshaft. You don't need uppers on the front. If you are concerned about centering your rear axle then you will need adjustable upper control arms.

 

I did a 2.5" lift on my last jk about 8 years ago w/o upgraded arms and I just put a 2.5" lift on my new JK with lower control arms last weekend. From my experience, I recommend front lowers. My last JK was very flighty after the lift where as my current one honestly drives like stock. I've ran both with the stock wheels/tires after the lift so possibly wider wheels/tires would make it feel more stable w/o the lowers

 

The lift is currently installed? Drive it and decide if the steering is a little too flighty. If so, get some form of caster correction. If you are ok with the steering, then don't worry about it.

If you do decide on adj arms, either upper or lower will work fine, they do the same thing. Upper will be cheaper, lowers will give a better range of adjustability. Or, you could look at drop brackets.

 

Front lca and rear uca at a minimum.

 

I have a Teraflex 2.5 coil lift with a jks adj front track bar. My tires are Mickey Thompson 315-70 mtz's...After measuring out everything I went with JKS fixed front lower control arms. They are just beefier arms that are slightler longer which in my case put castor correct. The joints are essentially the same quality as stock arms (which isnt saying much). But to my surprise the gamble to go fixed vs. adjustable paid off as it drives really well and adressed the flighty steering. I think I got them from Northridge for under $200. Adjustables with better joints are certainly the better option, but for me Im not lifting more than what I have and not planning to go up on tire size or change anything else so thats what I chose to do.

My point being that you might have success with just the front lca that are fixed if budget is the concern and 2.5" is all the lift you are going to run long term.

 

I'd say stock ones work just fine

 

Upper and lower control
Arms do not do the same thing. You can only go longer not shorter than stock.

If you want to correct your steering geometry you must have lowers in front. But keep in mind this will through your pinion angle off more. You can't have both correct without some slog officiant other mods.

 

It depends on what you are trying to achieve and the actual lift height you got from a particular lift. The higher you go the more things get out of whack. Generally it is better to go all adjusatble on a lift so thing can be set back to where they should be and you can easily make changes if you need to in the future. There are stickies at the top of the modified section that go over the parts and what they do so you can make a more informed decision.

 

That's why you also have adjustable uppers.