The TF 3" & 4" lifts are all around fine suspensions, with an upgrade path that seems to work. All that said, there are a couple problems:
o Stock rear track bar interferes with RR spring. Fix with RKs or Polys urethane rear spring wedges and/or Tera's adjustable rear bar. I did both.
o TF doesn't include steeing correction and bump steer was objectionable to me. I ended up adding Polys steering correction kit, which raises and reinforces the axle track bar mount and flips the drag link.
o TF supplies their "Monster" front track bar, which is way stout, but will hit the transmission cooler lines on full right front compression. I replaced it with Poly's adjustable front track bar.
o LF spring interferes with end of front sway bar. Caused by TFs offset upper spring seating coil, which tips left front spring forward, right front spring rearward. This is a tough one to fix, see below
o Sway bar links. Rears can hit rear brake hardlines on compression. Front left can hit LF spring, along with the end of the sway bar. I fixed both of these issues by throwing the TF links away and installing Poly's links. I adjusted the Poly front links up a bit, enough to provide sway bar to spring clearance. The Poly links have less bushing compression than the TF links and tighten handling up noticeable. No more issues
o Brake lines. Tera's simply aren't appropriate for JK calipers. Excessively long and vulnerable to snags, etc. I tossed them and use Poly's lines. Curries are good, too.
All that aside, I initially installed TF's full flex arm 4" kit with 3" springs & 35s. As predicted, by the end of the first season I wanted more, so it got 4" springs, which are MUCH better with this kit, and 37s, which work much better than 35s on an UL. It works great, is very stable & smooth on the highway and wheels like crazy on the trail.
Last edited by SoK66; 09-21-2010 at 10:38 AM.