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Old 08-24-2010, 12:17 PM   #1
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Drop Pitman?

Hey, need some advice on new to me 01. It has a 3" Black Diamond lift with no drop pitman and the bushing is blown at the TRE. Shop tells me he's surprised kit didn't come with one. Called BD and they said it's not recommended So..it drives ok, don't worry about it? Also, SYE, what exactly is the benefit/need? BTW, love my new ride

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Old 08-24-2010, 12:20 PM   #2
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I have a 3.5" Rubicon Express Superflex lift and I too was surprised by the lack of a drop pitman arm. I called RE and the tech assured me it wasn't recommended for the lift and that adding one would actually cause more binding than not having one.

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Old 08-24-2010, 12:27 PM   #3
Knows a couple things...

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Don't install that dropped Pitman arm, it will only cause bump steer... where the steering is forced hard left/right as you drive over bumps or dips in the road.

A dropped Pitman arm is only required on Wrangler TJs in very specific and uncommon circumstances.
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Old 08-24-2010, 12:33 PM   #4
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Thanks for the confirmation Jerry.
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Old 08-24-2010, 01:35 PM   #5
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Quote:
Originally Posted by Jerry Bransford
Don't install that dropped Pitman arm, it will only cause bump steer... where the steering is forced hard left/right as you drive over bumps or dips in the road.

A dropped Pitman arm is only required on Wrangler TJs in very specific and uncommon circumstances.
Jerry, why is that? My buddy who has a jeep with 35's, not sure on the lift, has a drop pitman arm, and has BAD bumpsteer. I look under it, but it doesn't even look like the (not sure the correct part name) "stabalizer bar" will reach without the drop pitman arm. Should he replace it?or just get rid of the pitman arm and all should be well?
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Old 08-24-2010, 01:43 PM   #6
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Because without a corresponding drop at the upper attach point for the track bar, installing a dropped Pitman arm by itself screws up the steering geometry which invariably causes bump steer. Tell him to get rid of his dropped Pitman arm. Doing so will cure his bump steer.

This illustration shows why... dropping the upper end of the drag link via a dropped Pitman arm would make those two parallel lines no longer parallel to each other. When they are not parallel to each other, bump steer is the result. Dropping the upper end of both via a dropped Pitman arm and a dropped upper track bar mount would keep the yellow and red lines (below) parallel so no bump steer would result.

So dropping them both or leaving them both undropped keeps the geometry parallel so no bump steer occurs. Dropping either by itself will cause bump steer.

This is somewhat unique to the TJ due to its improved inverted-Y steering geometry. Most other 4x4 vehicles including the older Wrangler YJ and CJs required a dropped Pitman arm after a suspension lift is installed.
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Old 08-24-2010, 01:50 PM   #7
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Cool thank you for explaining that. I will have him try that and see if it cures it for him.
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Old 08-24-2010, 02:54 PM   #8
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Thanks, for clarifying that. He actually stated it opposite, saying it needed to be parallel with the axle I was actually asking him originally about rock sliders with a step, to which he stated there was nothing out there like that when I just got done looking at about 10 styles online! So much for "the jeep guy"!
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Old 08-24-2010, 03:08 PM   #9
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Originally Posted by legman68 View Post
Thanks, for clarifying that. He actually stated it opposite, saying it needed to be parallel with the axle...
That is only true when the suspension doesn't use a track bar. The TJ, however, uses a track bar which means the drag link needs to be parallel to it and not to the axle.

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