What would I need to fit and run properly 40's on my 4door. How much lift would I need. What steering set up and so on.

 

Read this thread thoroughly it will give you a good idea where to start and help answer some questions.

https://www.jk-forum.com/forums/show...ery-Newbie-Has

 

So you want to have this discussion openly or do you want to PM me? Check out my set-up and albums and we can talk. I wheel it and drive it daily.

 

I'm running 40's on my 11 JKU. I have a TF 4" with half bump stops with adjustable arms, TF drag link flip, RCV axle shafts in front, flat fenders, and did some cutting in the wheel wells. Running a stock SS with no bump steer. Youll need arms to move the rear axle back and JkS spring perches to rotate the real coils. Stock Dana 44 axles with gussets. Depending on wheel bs, you may need to adjust the steering stops. I wheel hard for east coast wheeling. If ran Moab or such I'd prob be looking into a PR44 at minimum once my d44 went.