Jump to content

RE: Pitman Arm Height


Recommended Posts

From the steering box thread: "The Pitman arms are not the same. The ZJ arm drops about an inch lower than the XJ/MJ arm, so you'll have to use you're existing MJ Pitman arm on the new ZJ box."

 

So, I have to ask the dumb question, will that one inch difference really matter? Seems the linkage has enough vertical freedom to tolerate the ZJ arm? I have 2 inches of lift in front, and just

maybe, I can avoid fighting that pitman beast?

Link to comment
Share on other sites

Hmmm, no free lunch here I suppose. I was hopeful the lift and the lower pitman arm might just

cancel each other out. I may just try it out and see how bad this bumpsteer is. I can always swap

the arms once the box is installed. Probably easier to change it after the box is in anyways.

Link to comment
Share on other sites

So, I have to ask the dumb question, will that one inch difference really matter? Seems the linkage has enough vertical freedom to tolerate the ZJ arm? I have 2 inches of lift in front, and just maybe, I can avoid fighting that pitman beast?

 

Fight the Pitman beast. A 2" lift is not enough to warrant the use of the 1" dropped ZJ arm. It will knock your track bar and drag link out of parallel and as Correy says, you'll probably have tons of fun with bumpsteer. Mine came off pretty easy w. my 8" vice and 6' cheater bar. :yes:

Link to comment
Share on other sites

What the heck - give it a try. Like you say, you can always swap it out later. When I put in the ZJ box it was easy to see that the 1" drop would upset the parallel geometry w. my 3" lift, so I didn't try. Would be interested in the results. :D

Link to comment
Share on other sites

i put my zj box in two days ago and i couldn't get the mj pitman arm off so i said what the heck i'll try it with the zj arm. so far it hasn't bothered me yet. seems to steer fine and all. i'll eventually put the mj arm on...once i get it off :hmm:

Link to comment
Share on other sites

Where you will feel/notice bump steer is, as the name implies, when you go over bumps. A speed bump will do it, but you're traveling slow enough that you won't be bothered by it. Get on a faster piece of road that has undulations that alternately load and unload the front suspension, and that's when it appears. When the suspension compresses, the vehicle will dart to one side, and when the suspension unloads it'll dart to the opposite side -- all without your moving the steering wheel.

 

It's very unsettling, and IMHO unsafe.

Link to comment
Share on other sites

x2 :agree: broke the rustys trackbar mount on my zj that had no drop. for a quick fix i put my IRO 2" dropped trackbar mount on. in the city is fine, its a white knuckle drive on the fwy and i pretty much refuse to take in on there now. results and testicle size may vary

Link to comment
Share on other sites

Yup, :agree: keep the stock pitman arm if your track bar is in the stock mounting points. I had a 6" lift on my MJ and an adjustable track on the original mounting points. I tried a ZJ pitman because the pass tie rod was almost maxed out. I did get bumpsteer and it didn't seem too bad until I replaced it with the stock pitman arm. Then I realized just how bad it was. Lift isn't the critical factor, the track bar and drag link must be parallel.

Link to comment
Share on other sites

Not wanting to beat this horse too much longer, but my forum reading seems to indicate

that the track bar and the steering bar should ideally be closest to parallel. Here's

an image of what I have now, showing some divergence. My MJ pitman arm drop is

3 inches. The ZJ pitman arm drop is 3.5 inches. Could it be that the ZJ arm will actualy

bring these bars closer to parallel?

 

Link to comment
Share on other sites

Not wanting to beat this horse too much longer, but my forum reading seems to indicate that the track bar and the steering bar should ideally be closest to parallel. Here's an image of what I have now, showing some divergence. My MJ pitman arm drop is

3 inches. The ZJ pitman arm drop is 3.5 inches. Could it be that the ZJ arm will actualy bring these bars closer to parallel?

 

Draw a straight line between the two track bar mounting points. It's nearly parallel to the drag link in your rig.

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...