Originally Posted by RGR42
I have an 03 Rubicon with 5.5" of RE long arm suspension and I'm running 37" tires. I get a lot of bump steer and I've been reading that the TJ does not require a drop pitman arm when lifted. I had an alignment done yesterday and the guy said I needed a drop pitman arm. So, what do Y'all think?
On MOST 4x4 vehicles, you need to install a dropped Pitman arm when you install a suspension lift. That includes older Jeep CJs and Wrangler YJs with the square headlights.
But where '97 and newer Wrangler TJs are concerned, you do not usually need a dropped Pitman arm with a suspension lift. That is because '97 and newer Wranglers have a much improved steering geometry design.
In fact, you should NOT install a dropped Pitman arm onto a '97 or newer Wrangler for most suspension lifts including your RE 5.5" long-arm suspension. The only reason you would need a dropped Pitman arm is if you also installed the RE 1610 track bar with its required RE 1611 mounting bracket which drops the track bar's upper mounting point.
So if your upper track bar mount is stock and not dropped, which is how the RE1600 track bar installs, absolutely do NOT install a dropped Pitman arm.
But if you upgraded the trackbar to the stronger RE1610 model which includes the RE1611 dropped track bar mount, then you also need a dropped Pitman arm.
The Pitman arm and upper track bar must match... both must be either dropped or both must not be dropped. If one is dropped and the other is not, bump steer is the result.