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Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Bump steer and other questions

Bilstein Shock Upgrade Kits, Jeep JK TJ XJ Wranglers and CBaseline 4x4 Lifetime Warranty 4340 Chromoly Axle Shaft KiDana 30 Truss for your TJ, LJ, ZJ, and XJ

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Unread 07-11-2012, 08:06 AM   #16
Agony Wagon
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1995 XJ Cherokee 
 
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What does it take to get them the same length? What else do I have to buy???

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Unread 07-11-2012, 08:59 AM   #17
foggybottombob
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Don't worry about that. The effect of unequal length arms will be imperceptible from the picture you showed.
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Unread 07-11-2012, 04:50 PM   #18
flying_bosun
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Quote:
Originally Posted by foggybottombob
I don't understand what any of this has to do with a plane as someone mentioned
Since everything else you said is nearly spot-on, I'll not muddy the waters, but will add this to clarify the "shared plane" concept. Notice in diagram 3 below the tb and dl are parallel, but not in the same plane (fore to aft) and not sharing a radial center, so their arcs of travel are not common and bumpsteer is inevitable. I hope it helps. Here's the link for the original thread: http://www.jeepforum.com/forum/f9/tr...tions-1356624/

Quote:
Originally Posted by flying_bosun

At issue specifically was the "parallel" relationship required to avoid bump steer.

We've all heard that the TB and DL must be parallel and it's been suggested that with a DPA this could be accomplished by raising the axle end of the TB or by dropping the TB frame end. Initially this seemed reasonable to me from a geometric stand-point, but upon further examination it turns out not to be the case; the problem is that our axles articulate.

Here are some rough diagrams that may help some to understand what I mean.

image-1665118114.jpg

image-3542679556.jpg

image-804048203.jpg

image-4060269015.jpg


For lack of a better explanation, bump steer occurs when the relative arcs' of travel don't share a (nearly) common center. This is because as the axle articulates, the push/pull forces acting on the axle via the track bar are at times contrary to the push/pull forces acting on the steering knuckle via the drag link.
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