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Old 03-17-2014, 08:30 AM   #1
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Track Bar and Pitman Arm

Any suggestions on what length to adjust my front lower control arms on my 09 JK with four inch lift? My track bar is coming in contact with my pitman arm shaft/nut. Currently running RC adjustable track bar with raised track bar bracket and RC adjustable front lower CA's. Installed my Synergy Flipped Drag Link this weekend. RC wrote me back and said it sounds like I need to move my axle back a little bit. What are some lengths out there being ran? I still have a little pinion angle in the downward position. Looks like if I shorten them it will correct the angle?
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Old 03-17-2014, 08:35 AM   #2
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Another issue is my track bar is on the front side of the pitman arm shaft. Don't think I have enough threads on my heims to pull the axle all the way back for clearance.

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Old 03-17-2014, 07:00 PM   #3
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Anybody have this issue?
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Old 03-17-2014, 08:13 PM   #4
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Didn't we go over this ?

I wouldn't go changing pinion/caster to prevent pitman/TB contact. Pinion angle is sensitive at 4" of lift. If the jeep drives well/no vibes, Id be looking for a new track bar instead.
My TF track bar runs close and will hit. I'll be replacing it with a Synergy bar soon.
Jeep Jk, Caster and lifting. shows how to check pinion angle yourself. Your arms are probably going to be a little longer then stock. A little more then 23" with stock uppers.

How about some pics. Not sure what your 2nd questions is?
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Old 03-17-2014, 08:16 PM   #5
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Thinking about what RC said. Wouldn't moving the axle back move the track bar closer to the pitman arm ?
Also ... In order to move the axle back you need both uppers and lowers. Moving lowers in or out will rotate the axle more then reposition it.
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Old 03-17-2014, 08:18 PM   #6
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The actual length of the CAs is not what matters it should be defined by providing the best tradeoff between Caster and pinion angles. KJeepe10 did a great a writeup on the process.
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Old 03-17-2014, 09:41 PM   #7
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Quote:
Originally Posted by kjeeper10 View Post
Didn't we go over this ? I wouldn't go changing pinion/caster to prevent pitman/TB contact. Pinion angle is sensitive at 4" of lift. If the jeep drives well/no vibes, Id be looking for a new track bar instead. My TF track bar runs close and will hit. I'll be replacing it with a Synergy bar soon. Jeep Jk, Caster and lifting. shows how to check pinion angle yourself. Your arms are probably going to be a little longer then stock. A little more then 23" with stock uppers. How about some pics. Not sure what your 2nd questions is?
Yes, we did go over this. It's becoming rocket science to me. Seems like every move I make I then run into another problem. But that's how we learn I guess.
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Old 03-17-2014, 09:45 PM   #8
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Quote:
Originally Posted by kjeeper10 View Post
Didn't we go over this ? I wouldn't go changing pinion/caster to prevent pitman/TB contact. Pinion angle is sensitive at 4" of lift. If the jeep drives well/no vibes, Id be looking for a new track bar instead. My TF track bar runs close and will hit. I'll be replacing it with a Synergy bar soon. Jeep Jk, Caster and lifting. shows how to check pinion angle yourself. Your arms are probably going to be a little longer then stock. A little more then 23" with stock uppers. How about some pics. Not sure what your 2nd questions is?
Sorry about the second question. RC informed me today that I should shorten my lower CA's to move my axle away from my pitman arm. Thinking this thru now it doesn't make sense. It would put the track bar at an akward angle?
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Old 03-17-2014, 11:56 PM   #9
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Quote:
Originally Posted by Yeti83 View Post
Sorry about the second question. RC informed me today that I should shorten my lower CA's to move my axle away from my pitman arm. Thinking this thru now it doesn't make sense. It would put the track bar at an akward angle?
It would increase pinion angle -which is not a bad thing, but will degrade handling. Like I said, adjusting only one set rotates the housing. Not so much move it fore/aft.
If you were to shorten both uppers and lowers (if you had uppers) the TB will pull in slightly toward the pitman arm. actually... If you think about it. It wouldn't be a lot, because the frame side is fixed closest to the pitman arm.

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