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Unread 04-01-2002, 10:34 PM   #1
Mudpig
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shackle reversal

Anybody done a shackle reversal? Is it worth it? Does it drive any better and does it lift at all? I've heard of one that gives 2 inches of lift. Anybody....

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Unread 04-02-2002, 06:44 AM   #2
RodeoRob
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Sure, plenty have done it including myself (mine just not being on a Jeep). It will most definitely help out your ride quality. The front suspension will then be able to travel in the natural direction of the bump rather than fighting/working against them. You probably will get a minor about of lift, how much i'm not sure.

If you look at other vehicles that came from the factory with leaf sprung front ends, most will have shackle reversal. Jeep is in the minority for putting shackles up front.

I did this procedure on my Isuzu when i converted from independent front suspension to a solid front end with leaf springs. The ride quality is no worse over the bumps than my IFS was (and IFS has the best reputation for a smooth ride).

-Rob
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Unread 04-02-2002, 07:48 AM   #3
Mr. Mopar
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hey mudpig what kind of $ does a shackle reversal set one back, you said you ckecked into one.
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Unread 04-02-2002, 07:51 AM   #4
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hey mudpig does ( north of you ) mean you live in canada.
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Unread 04-02-2002, 04:43 PM   #5
4wheeler4CJ
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Before you commit yourself to a shackle reversal, do some checking. It's a bit of a pain in the A** to install (some buddies have done it), and, in many cases, will not be a benefit. I remember checking into it a while back extensively, and I decided against it. I apologize for not remembering why, but I'm sure it was a good reason, since it was for my next project, which will be built with every detail in mind. Check into it more, is all I'm saying. Don't commit just because some people have done it.

Remember, just because something is done often, doesn't mean it's the thing for you, or that it is worth it. <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-02-2002, 05:14 PM   #6
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Trailmaster has a (shackle inversion) kit for $200.00 and it is a bolt on kit. I think it is the same princeable. I heard good things about it. Quadratec's gotum in there new catalog. Check it out!
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Unread 04-02-2002, 06:31 PM   #7
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Hey Mr.Mopar,

Most of the kits that I find here in Calgary are around the $400 mark. Things that you may need to do beyond the kit are:
</font>
  • <font size="2" face="Verdana, Arial">Brake line extension</font></li>
  • <font size="2" face="Verdana, Arial">Long travel front drive shaft</font></li>
  • <font size="2" face="Verdana, Arial">Relocation of front axle forward approx. 1"</font></li>
  • <font size="2" face="Verdana, Arial">Extended rear shackles
    </font></li>
<font size="2" face="Verdana, Arial">Most of the kits that I have found lift anywhere from 1" to 2", depending on the type of springs that you use.
Hope this helps you a bit ..
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Unread 04-02-2002, 07:22 PM   #8
osburn
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Looks to me like this guy is running stock springs. The shackle reversal only moves the tire backwards on compression with arched springs. The opposite is true with flat stock springs.
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Unread 04-02-2002, 10:16 PM   #9
Mudpig
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Yes Mr. Mopar I live in Canada.(Smithers B.C.) and I believe Naekid is right, a shackle reversal is about $400 in Canada. I was looking at the s/reverse because my shackles on the front are to long(they dig in to the dirt on sharp angles) and I need the extra 2" to compensate for the Buggy set up at the back. <img border="0" title="" alt="[Eek!]" src="eek.gif" />
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It's a jeep thing, I do understand!! 89 YJ Laredo,4.2L carburated. Chrome bumpers and grill. 31 AT's on 9x15 chrome modulars. Mustang GT buckets. 3" body lift and 1 1/2" shackle lift. Completely emission & computer free. Runs great!! Took the shackle lift out, they suck!!
Soon to be SOA with 35's
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Unread 04-03-2002, 01:40 AM   #10
Mr. Mopar
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400 bones i think i will try to make a set. all i need is some steel , some beer , and a few bad words. Im sure i can do it.
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Unread 04-03-2002, 06:49 AM   #11
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 4wheeler4CJ:
<strong>It's a bit of a pain in the A** to install (some buddies have done it), and, in many cases, will not be a benefit.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Yea, i agree installation is somewhat advanced, but not a benefit? I've seen the shackles in front/rear for offroad performance debated before, but i have a hard time believing anyone would argue that a shackle reversal doesn't provide a much better onroad ride.

arched lift springs or flat ones, shackle reversal is allowing the travel of the shackles to flow in a natural direction over bumps, rather than have to work against it to flex.

If you're comfortable with metal fab, you should be able to make one relatively easy... no need for a kit. Most kits will relocate the axle forward 1-2" to allow for axle flexing back under compression.

-Rob
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1995.5 Isuzu Rodeo - SAS'd and SOA'd, sitting on 36x12.50 TSLs, D44 front, 14bff rear, locked by OX and Detriot, suspensions by Jeep and Chevy, high steer conversion, 5.13 gearing and Teralow in the case.
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Unread 04-03-2002, 09:41 AM   #12
osburn
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by RodeoRob:
arched lift springs or flat ones, shackle reversal is allowing the travel of the shackles to flow in a natural direction over bumps, rather than have to work against it to flex.
[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Arial">Not true. Do the geometry dude. The axle moves backwards on a bump with a flat spring, and so does the shackle. That's why Jeeps come from the factory with the shackle in front.

Here's a flat line

A-----------------------B

Let's say A is the front of the Jeep. Make B a fixed point. Arch the line, but keep it the same length and tell me which direction A will travel.
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Unread 04-03-2002, 10:54 AM   #13
4wheeler4CJ
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Osburn is right, that's one of the reasons to argue against shackle reversals. Many of us have flat springs (or damn close), and geometry doesn't lie.
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Unread 04-03-2002, 11:59 AM   #14
Mr. Mopar
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Osburn you just proved yourself wrong.

A-------B--------C

mabey this geometry will help. A= shackle, B= axel, C= spring mount. when your axle ( B ) goes over a bump the jeep is going towards the bump ( unless you are driving in reverse ) and naturaly the axel wants to go back, IT CANT!!!!!!!!!! C= spring mount, the spring mount wont move its fixed to the jeep. in order for the axle to get over the bump the leaf spring has to bend ( or your jeep would be an even worse ride ). when your spring bends the arch goes flat or flater, and so point A and C need to go away from each other. the only way they can do this is for A to move away from C because C is fixed to the frame. so A moves and moves B with it, it has to. wich way wil B move it has to move forword to get over the bump in that small moment the axel is going faster then the jeep.
now for all of you who have flat springs, get them fixed they came from the factory with an arch.
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Unread 04-03-2002, 02:40 PM   #15
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I hardly proved myself wrong. If the spring is flat, the axle moves rearward even in your drawing. To say it gets "flater", well, how could I argue with that? If the spring is flat, then it gets curved by the upward motion and the axle moves rearward. And this is pretty much true even on a slight arch. While the tiniest of bumps would move the axle slightly forward. But, once the spring goes past flat and then into an upward arch, which is the case on any hard bump or cycle of the suspension, the axle moves rearward. This is why many SOA guys on flatter springs have problems with rubbing tires on the rear edge of front fenders. This is exactly why Jeeps come from the factory with the shackles in the front. Once you put in lift springs, you change all this and that's where there are advantages to the shackle reversal. But not on stock springs.
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