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Unread 01-03-2012, 07:10 PM   #1
TwistedDrum5
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Drop Pitman Arm on 3" lift?

I know this gets covered a lot, but I feel like I have special circumstances that usually don't get brought up.

It's a 2004 LJ and this weekend I will be doing the classic junkyard lift with V8 XJ Springs and putting my front springs in the rear. This thread is not about whether that's a good idea or not, so please don't' comment on that.

I already have One ton steering, and stock track bar.

My understanding is that if I use a trac bar bracket on the top of the trac bar then I will need a drop pitman arm.

As of right now I am planning on using the bracket at the bottom of the trac bar (front bracket is on the right)


I feel like if I use both the DPA and the trac bar relocation bracket its really going to screw things up. But maybe I'm just crazy.

Should I use the DPA or not?


EDIT:



If you look in this picture, pushing the trac bar to the right from the bottom of the bracket will give it a steeper angle. Then if I put the DPA on it would give the drag link a less steep angle. The angles would be really off, causing crappy driving conditions, right? I realize the pic is not one ton steering, which is why I decided to make a thread.

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Unread 01-03-2012, 07:24 PM   #2
Jeepson33s
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I just went through this with my lift...if you use a front track bar relocation bracket then you need to use a drop pitman arm. I was lazy and didnt want to pull my old one off so i tried it without it and had a large amount of bump steer...put the arm on and bump steer was gone.
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Unread 01-03-2012, 07:28 PM   #3
TwistedDrum5
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Quote:
Originally Posted by Jeepson33s View Post
I just went through this with my lift...if you use a front track bar relocation bracket then you need to use a drop pitman arm. I was lazy and didnt want to pull my old one off so i tried it without it and had a large amount of bump steer...put the arm on and bump steer was gone.
Now im worried about using that bracket. Reading some bad things on here about it. That bracket actually attaches to the bottom mount, not the top. Is that the same one you used?
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Unread 01-03-2012, 07:30 PM   #4
Gary2
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thats the key thing here read ...........
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Unread 01-03-2012, 07:31 PM   #5
Barcus
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On 3" of lift you don't need a DPA or a drop bracket with your TB. You'll be fine not using either one of them
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Unread 01-03-2012, 07:33 PM   #6
TwistedDrum5
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Would putting a DPA on hurt it? I ask because I have the opportunity to get a DPA for free for my stock one. Eventually I'll probabaly go a full 4/4.5in kit. But don't want to put parts on now that are only going to hurt me in the long run.
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Unread 01-03-2012, 07:36 PM   #7
Gary2
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and the same for a 4" , no matter how many Rough Country or any one else puts in the box without a track bar drop bracket for the frame end
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Unread 01-03-2012, 07:44 PM   #8
Jerry Bransford
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Installing a dropped Pitman arm when the right angles requiring a DPA are not present will result in bump steer... unwanted left/right steering in response to the front suspension cycling up/down.

A dropped Pitman arm is only needed when you have dropped the driver's side (upper end) of the track bar. That lowers the driver's side of both of them, keeping the track bar and drag link parallel (the never ending goal) with each other.

If you were to use a passenger-side drop bracket for the drag link, as that bracket is for, a bad idea no matter how you look at it, that means you absolutely cannot drop the Pitman arm.

The goal is to keep the track bar and drag link parallel. Period. If you drop the top end of one, you have to drop the top-end of the other to keep them parallel. Following so far? So if you drop the passenger side of the track bar via that bracket, a bad idea anyway, then that means you would need to drop the passenger-side of the drag link (which you can't do) to keep them parallel.

Non-parallel trackbars and drag links mean bump steer.

Leave well enough alone, don't install that bracket and don't install a dropped Pitman arm. The ONLY time you should install a dropped Pitman arm is when you have dropped the upper/driver's side of the track bar.
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Unread 01-03-2012, 07:44 PM   #9
Jeepson33s
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I used the upper bracket that moves the aftermarket adjustable track bar down and so the steering line has to go down with it to prevent bump steer. I understand it as if the track bar goes down (imaginary line) then so does the steering. I have never seen one like that...i have seen people drill holes in the stock track bar location to center up the axle with a smaller lift.
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Unread 01-03-2012, 07:56 PM   #10
TwistedDrum5
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Quote:
Originally Posted by Jerry Bransford View Post
Installing a dropped Pitman arm when the right angles requiring a DPA are not present will result in bump steer... unwanted left/right steering in response to the front suspension cycling up/down.

A dropped Pitman arm is only needed when you have dropped the driver's side (upper end) of the track bar. That lowers the driver's side of both of them, keeping the track bar and drag link parallel (the never ending goal) with each other.

If you were to use a passenger-side drop bracket for the drag link, as that bracket is for, a bad idea no matter how you look at it, that means you absolutely cannot drop the Pitman arm.

The goal is to keep the track bar and drag link parallel. Period. If you drop the top end of one, you have to drop the top-end of the other to keep them parallel. Following so far? So if you drop the passenger side of the track bar via that bracket, a bad idea anyway, then that means you would need to drop the passenger-side of the drag link (which you can't do) to keep them parallel.

Non-parallel trackbars and drag links mean bump steer.

Leave well enough alone, don't install that bracket and don't install a dropped Pitman arm. The ONLY time you should install a dropped Pitman arm is when you have dropped the upper/driver's side of the track bar.
Thank you Jerry, and everyone else who helped.

Looks like I will not be using the bracket, and I won't be switching Pitman arms out.
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Unread 01-03-2012, 08:23 PM   #11
TwistedDrum5
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Even with the One Ton steering ill get bump steer? Trying to help a friend out who needs to get rid of his drop pitman arm for a stock one. But I don't wan't to do it if its going to hurt me.
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Unread 01-03-2012, 09:13 PM   #12
Gary2
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I wouldn't use the drop pitman unless you are going to lift yours about 5.5" or taller and use the fore mentioned drop track bar bracket
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Unread 01-04-2012, 12:17 AM   #13
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Here's how you want the trackbar and draglink relationship. PERIOD. Mine are both straight so it makes it easier to see but even with a bent trackbar and draglink... you would draw a line through the joints creating the straight line then they need to be parallel.

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Unread 01-04-2012, 07:19 AM   #14
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Quote:
Originally Posted by TwistedDrum5 View Post
Even with the One Ton steering ill get bump steer?
This is a matter of geometry, not tonnage.
Quote:
Originally Posted by TwistedDrum5 View Post
Trying to help a friend out who needs to get rid of his drop pitman arm for a stock one. But I don't wan't to do it if its going to hurt me.
Why do you think he wants to get rid of it?
You can pick up a stock pitman arm all day for $20 on Ebay. If he needs it that bad, then tell him to go buy it. A DPA is absolutely not needed with your setup, assuming your angles are already good with the stock mounting points.
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Unread 01-04-2012, 07:58 AM   #15
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Quote:
Originally Posted by Jerry Bransford View Post
will result in bump steer... unwanted left/right steering in response to the front suspension cycling up/down.
Jerry,

Can you explain this? It sounds like an issue I may be having and wondering if I need to look at my trackbar and draglink relationship
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