Sorry that I'm starting a new thread but I can't find the info I need and I want to do this right the FIRST time. I want to do a 4" suspension lift and run 35's but I'm sure there's more I need to do other than just a lift and tires. Can the stock axle on a 2-door JK hand that size tire? Do I need to re-gear? If so, to what? Also do I need to do brake lines? Are long arm kits really worth the extra money? I'm new to this and would appreciate any info needed. Thanks.

 

Hey, well any lift over 2.5 you need new driveshafts. Whats your purpose for a jeep? read this thread and ask yourself, do you realy need 4 inch lift and big tires? click that https://www.jk-forum.com/forums/modi...-lifts-288269/

 

Start with the two threads stuck to the top of this modified area, they have a ton of useful information in them.

Then understand that there is no perfect one-size-fits-all answer to any of your questions, so fill in your full vehicle profile, or give all of the info here, (different years have different engines/transmissions. Different models have different axles/tcases. Which of the three gear sets are currently in it. etc, etc, etc), and then tell us about your budget, and your actual needs/wants/usage. Also pay attention to the replies you get, since you will invariably be getting gearing advice from people with a completely different engine/transmission combo than you, or whose usage/needs are vastly different than yours, or...

These questions are asked on a daily basis, so there are literally a thousand other threads to search on and read through. It would be time well spent before pulling out the plastic for something that turns out to be wrong for your needs.

 

First, welcome to the forum. Second, these days a lot of folks are using apps on phones and tablets, which means they can't see your profile (if you've filled it out). So it is a good idea to provide info about your Jeep such as year, gears, transmission, etc. It is also better if folks know what you plan to do with this Jeep. Rock crawling? Expedition travel? Trips to the hunting lodge? Mall crawling? This will net you better advice.

1. Plenty of folks running 35s on all manner of JKs. Some of us have strengthened the axles with new shafts, sleeves, gussets, trusses, CV joints, etc.

2. Regearing is a complex topic. No one can provide a specific answer to your question without knowing more about your Jeep.

3. I should think most 4" lifts come with brake lines. Regardless, you'll need to do something to ensure they don't get damaged. At 2.5", when I had OEM lines the fronts stretched pretty bad when fully drooped. This was after rerouting the line to take advantage of every bit a slack I could.

4. Long arm kits give better geometry for longer travel suspensions. They offer the opportunity for a smoother ride and more articulation.

A closing note: A 2.5" lift is easier to install and makes your Jeep more mechanically reliable than a 4". Because of lower center of gravity, it is safer in off-camber situations. The 4" offers slightly improved approach, breakover and departure angles. It does not improve ground clearance--tire size does that.

 

You have several days of reading to do. Read the FAQs above. Then search each specific question. Then realize that you will rarely get a cut and dry answer (especially if you ask for specific recommendations). Also, the chances of you getting it right the first time are slim.