Yeah I have the front trackbar and I too have the annoying bottoming out noises! I am super interested in going to the 4 inch as well so I am trying to fig out what else I need. I know there's a different rear trackbar bracket that comes with the 4 inch but do we remove the 2.5 bracket and use the other one? Do we need a rear adj trackbar as well?! Brakelines, different bumpstops, driveshafts?!
I do not have adj upper control arms do I need them with a 4 inch?!?

 

Hi, I am investigating the 4" coils as we speak, put some feeders out and lets see what TF comes back with. The 2.5" coils seems to be pretty compressed even with my jeep empty. Even with the lower arms only adjustable as we have plenty of adjustable space I don't think you need to change. I have my upper and lower control arms as short as possible so should have plenty room to adjust the axle for the 4" coils.

I don't think we need new drive shafts as the 4" lift coils probably give us a 3-3.5inch lift hence no issue. Same for the brake lines I used the TF brake line extensions and there is plenty height left.

Referring to bottoming out, at the moment I don't have the noise and the TF rear extension bracket goes well past the axle mount. If you still have the noise you need to readjust your axle again.

I assume we indeed need to upgrade to a TF or JKS adjustable trackbar as continue to lower the axle bracket is not the way forward, the forces become too large and the bracket will break in the end. Let me do some digging into a new mount, I have seem some brackets which you weld on your axle giving it the right support when flexing your axle. Let me find out

Cheers,

mark

 

I have spring perch relocates and Jks adjustable rear end links to help. I was just wondering if I need front upper control arms for a 4 inch lift.
The brakelines I know are borderline with brakeline extensions. If you were to disconnect your swaybar its close with 2.5, I was told when a person goes bigger lift the shocks are longer so you must out longer brakelines on.