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Need Guidance on Proper Lift Geometry

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Old Jun 10, 2013 | 05:12 PM
  #1  
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Default Need Guidance on Proper Lift Geometry

ok people i hate to start a new thread but i just need to get a straight answer vs. searching and trying to weed out all the crap, sorry ahead of time.....

Heres what i have, 4 Inch Fabtech Springs and have a RK front adjustable TRAC bar, now i do want to go with the flip kit for the drag down the road but for right now im trying to figure out a way to properly lift without having to use this supplied drop pitman arm. Will i need a drop bracket as well? if so should i go with axle side or frame side mount? Im assuming from what ive been reading that should be all i need in the front minus some brake line drop brackets and some bump stop extensions, while im on bump stops ive found that 3 inch extensions would be best with a 4 inch lift?

Now on the rear im wanting to get a RK trac bar bracket but i dont think that will be enough? im assuming i will need an adjustable rear trac bar as well?

Im really enjoying building my lift this way but i know some will find this post annoying as many people post alot of crap, this to me is how i learn as the last solid axle rig i had was super duty with a leveling kit.......Thanks again!!!!!

Last edited by xp1ik05; Jun 11, 2013 at 02:59 AM.
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Old Jun 10, 2013 | 05:48 PM
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and have a RK front adjustable sway bar
This is supposed to be Adj trackbar?

You want the trackbar and drag link to be parallel to each other, and as flat as you can get them. After installing those 4" coils, they should still be parallel, just at a steep angle. (with the bends in the various mfg's bars, it may be easier to just take a frontal pic, and draw lines from mounting hole to mounting hole)

The drop pitman will be used in conjunction with a trackbar relo bracket to keep them parallel while flattening the steep angle. Use one without the other, and they will no longer be parallel, which will cause some handling issues. (I am not up to speed on the various brackets, but I assume that there is a difference between a trackbar relo bracket that functions just to center the axle, and a relo bracket that also corrects for a drop pitman?)

Since you have an adj trackbar and are going with a flip, don't install the drop pitman/bracket and just live with the steep angle for a while.

You didn't mention caster correction? If you have not addressed it already, a set of front lower adj ca's should be at the top of your list. Then a set for the rear. And then be sure and crawl underneath on a regular basis to check both driveshafts.

The faq's also have some good info to get you pointed in the right direction. Or at least enough to confuse you and bring up a few more questions to ask.

Last edited by nthinuf; Jun 10, 2013 at 05:59 PM.
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Old Jun 10, 2013 | 06:07 PM
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I wouldn't install the bracket or the drop pitman arm. Drop pitmans put more stress on your sector shaft in your steering box and are know to snap.

Get the synergy drag link flip kit. Comes with axle side trackbar relo bracket, And the drag link is flipped ontop of the knuckle.

If not just leave it stock for now. That's how I am running mine right now with adjustable track bar on 4" of lift. I do get bump steer and wander, but it's not too Bad.

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Old Jun 10, 2013 | 06:18 PM
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You do need a relocation bracket for the rear trackbar to center your rear axle and keep your roll center. I am surprised that a kit of that height didn't come with one. You may also need one for the front trackbar depending on far off center the front axle is.

As for the drop pitman arm. I have been told that they do not work well on a Jk and cause undo stress. the draglink flip being the much better option. Others will probably chime in on that note.
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Old Jun 11, 2013 | 03:03 AM
  #5  
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Originally Posted by nthinuf
This is supposed to be Adj trackbar?

You want the trackbar and drag link to be parallel to each other, and as flat as you can get them. After installing those 4" coils, they should still be parallel, just at a steep angle. (with the bends in the various mfg's bars, it may be easier to just take a frontal pic, and draw lines from mounting hole to mounting hole)

The drop pitman will be used in conjunction with a trackbar relo bracket to keep them parallel while flattening the steep angle. Use one without the other, and they will no longer be parallel, which will cause some handling issues. (I am not up to speed on the various brackets, but I assume that there is a difference between a trackbar relo bracket that functions just to center the axle, and a relo bracket that also corrects for a drop pitman?)

Since you have an adj trackbar and are going with a flip, don't install the drop pitman/bracket and just live with the steep angle for a while.

You didn't mention caster correction? If you have not addressed it already, a set of front lower adj ca's should be at the top of your list. Then a set for the rear. And then be sure and crawl underneath on a regular basis to check both driveshafts.

The faq's also have some good info to get you pointed in the right direction. Or at least enough to confuse you and bring up a few more questions to ask.
yes my bad meant trac bar haha, im glad im not the only one confused on which bracket is which, guess thats what im trying to figure out, i dont want to use this drop arm if i dont have to, i was trying to avoid shelling out the money for a flip kit right off the bat, plan on down the road though, i did forget to mention that i will be getting drop brackets for the control arms till i can upgrade to some adj arms, i read through the FAQ's section, there is a ton of info but it seems more genaric and not too indepth when you start to get into building up a lift......thank you
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Old Jun 11, 2013 | 03:05 AM
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Originally Posted by ChesterJFK
I wouldn't install the bracket or the drop pitman arm. Drop pitmans put more stress on your sector shaft in your steering box and are know to snap.

Get the synergy drag link flip kit. Comes with axle side trackbar relo bracket, And the drag link is flipped ontop of the knuckle.

If not just leave it stock for now. That's how I am running mine right now with adjustable track bar on 4" of lift. I do get bump steer and wander, but it's not too Bad.

Sent from my iPhone using JK-Forum
so all you have is a trac bar? did you drop your control arms or change them? ill look into the synergy kit, have only heard reviews from the evo flip but its expensive
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Old Jun 11, 2013 | 03:06 AM
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Originally Posted by jtphoto JK
You do need a relocation bracket for the rear trackbar to center your rear axle and keep your roll center. I am surprised that a kit of that height didn't come with one. You may also need one for the front trackbar depending on far off center the front axle is.

As for the drop pitman arm. I have been told that they do not work well on a Jk and cause undo stress. the draglink flip being the much better option. Others will probably chime in on that note.
well i didnt get a "kit" just pieces here and there, im trying my best to avoid this drop arm like a plague.
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Old Jun 11, 2013 | 01:46 PM
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so is there any other safe way to set up the front end till i get a drag link flip kit?
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Old Jun 11, 2013 | 02:47 PM
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Don't stress over it. Lift it. Drive it. Then decide how soon you need to take care of any issues. You may find that the handling isn't as bad as you imagine it will be. (or it could be worse ) As long as the bars are relatively parallel, I think the caster correction will make a much bigger difference in driveability than having the flatter angles from a flip.

I have been been at 4" for over 3 years without a flip. It has been on the list, just another of the things I haven't gotten to yet. (the rest of my steering components are all synergy, so that is the flip I'll go with also. Eventually).

Last edited by nthinuf; Jun 11, 2013 at 02:50 PM.
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Old Jun 11, 2013 | 02:53 PM
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Originally Posted by nthinuf
Don't stress over it. Lift it. Drive it. Then decide how soon you need to take care of any issues. You may find that the handling isn't as bad as you imagine it will be. (or it could be worse )

I have been been at 4" for over 3 years without a flip. It has been on the list, just another of the things I haven't gotten to yet. (the rest of my steering components are all synergy, so that is the flip I'll go with also. Eventually).
Agree with above. lift it, drive it, enjoy it. You'll know when its time. I am at 3.5" with no flip and no issues. I plan to flip as factory parts wear out.
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