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Old 05-29-2007, 08:37 PM   #1
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3" lift and a dpa

I'm getting the 3" full traction lift. It comes with a adjustible front trac bar but no dpa.Will I need a dpa.

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Old 05-29-2007, 09:00 PM   #2
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nope

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Old 05-29-2007, 09:14 PM   #3
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cool
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-29-2007, 09:29 PM   #4
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No, and to add to the importance of not installing one for your particular lift height and configuration, your TJ would develop bumpsteer if a dropped Pitman arm was installed.
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Old 05-29-2007, 09:31 PM   #5
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I think Jerry has an alert that pops up on his computer when someone types in "dropped pitman arm". Then he goes to a phone booth, changes into his cape and zooms in to answer the question.
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Old 05-29-2007, 09:35 PM   #6
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He has a word document of pre-fabricated replies. Then just copy and pastes.
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Old 05-29-2007, 09:37 PM   #7
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That's how I'd do it.
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Old 05-29-2007, 09:54 PM   #8
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No, and to add to the importance of not installing one for your particular lift height and configuration, your TJ would develop bumpsteer if a dropped Pitman arm was installed.
Ya why do dpa's cause bump steer?
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-29-2007, 10:00 PM   #9
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^ oh jeez here we go again..
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Old 05-29-2007, 10:11 PM   #10
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Ya why do dpa's cause bump steer?
well is really very simple.. let us use some math:

A= load B= force C=the load force D= force over distance

so A[B+C]-D= x (bump steer) Of couse we have to input some know varibles.. I like to use the Load force of the muffler bearings as its close to the force of the drop pitman arm. Then for my load value I use the standed 3.14 circle math and then divide the log of the cos. Follow all that? Good, now add up the fiter carbs, but don't forget to account for the inverse clangston metering scale. When one applies solid math it really makes it so easy.
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Old 05-29-2007, 10:14 PM   #11
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cool.... now explain the pythagorean theorem.
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Old 05-29-2007, 10:24 PM   #12
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A^2 + B^2 = C^2 :d
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Old 05-29-2007, 10:24 PM   #13
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He has a word document of pre-fabricated replies. Then just copy and pastes.
I wish I did.
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Old 05-29-2007, 10:25 PM   #14
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Originally Posted by 4Jeepn View Post
well is really very simple.. let us use some math:

A= load B= force C=the load force D= force over distance

so A[B+C]-D= x (bump steer) Of couse we have to input some know varibles.. I like to use the Load force of the muffler bearings as its close to the force of the drop pitman arm. Then for my load value I use the standed 3.14 circle math and then divide the log of the cos. Follow all that? Good, now add up the fiter carbs, but don't forget to account for the inverse clangston metering scale. When one applies solid math it really makes it so easy.
You forgot the ever important cosine of the angle of the dangle.
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Old 05-29-2007, 10:27 PM   #15
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So, is there ever a case when you need a dreaded drop pitman arm???



(and AzTJ - that's the theorem, it lacks explanation )
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Old 05-29-2007, 10:29 PM   #16
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Ya why do dpa's cause bump steer?
Because the track bar and drag link must remain parallel to prevent bump steer, you cannot adjust (lower) the angle of the drag link via a dropped Pitman arm without disrupting that parallel relationship. Once they are no longer parallel, bump steer results.

So if you drop the upper end of the drag link via a dropped Pitman arm, you must also drop the upper end of the track bar via a dropped bracket to keep them parallel. Dropping either without dropping the other at the same time causes bump steer.

This is unique to the TJ's and XJ's inverted Y steering, the CJ and YJ both have an older design steering geometery that usually needs a dropped Pitman arm after installing a suspension lift.
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Old 05-29-2007, 10:36 PM   #17
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(and AzTJ - that's the theorem, it lacks explanation )

It explains itself
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Old 05-29-2007, 10:39 PM   #18
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Ya why do dpa's cause bump steer?
In a properly setup steering/suspension, the track bar and drag link are parallel. When they are parallel, the cycling of the suspension does not cause the steering wheel to move. If the track bar and drag link are not parallel, when the suspension cycles it will put force onto the drag link which causes the steering to move (ie bump steer). A DPA in and of itself does not cause bumpsteer but using one can cause bumpsteer if you do not take into account that it is no longer parallel to the track bar. You can use a DPA with any lift as long as you relocate the track bar with a drop (frame side) or raised bracket (axle end) in order to keep the two parallel.
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Old 05-29-2007, 11:41 PM   #19
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You forgot the ever important cosine of the angle of the dangle.
Jerry,

You are correct I will however assume you are talking about the norton angle of the dangle not the tinker waggle angle of the dangle.. which I am sure you know relates to the mating habites of the pork spin potting yellow horned rimmed mouse. (african varity of course)
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Old 05-30-2007, 12:27 AM   #20
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Jerry,

You are correct I will however assume you are talking about the norton angle of the dangle not the tinker waggle angle of the dangle.. which I am sure you know relates to the mating habites of the pork spin potting yellow horned rimmed mouse. (african varity of course)

I have a bellybutton.
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Old 05-30-2007, 12:45 AM   #21
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In the famous words of tiny terror:













Wankers .
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Old 05-30-2007, 12:52 AM   #22
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In the famous words of tiny terror:
Wankers .
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Old 05-30-2007, 01:21 AM   #23
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I run the same FT lift. No pitman arm. Instructions are China crap though. PM me if you have questions on the install. PS- get a spring compressor.
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Old 05-30-2007, 03:41 PM   #24
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cool thanks.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-31-2007, 08:52 AM   #25
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I think Jerry has an alert that pops up on his computer when someone types in "dropped pitman arm". Then he goes to a phone booth, changes into his cape and zooms in to answer the question.

HAHA, thats great.....I'm glad he does tho

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