What induces "shackle inversion"? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-14-2002, 05:54 PM
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What induces \"shackle inversion\"?

I went wheelin' yesterday to test out the new suspension/steering(89 YJ 2.5" OME springs, SOA, w/MORE crossover steering).. well, this has never happened to me before, but my shackles inverted THREE times up in front.. I'm running stock shackles..before, I was running a normal SOA setup, w/1" lift shackles.. I'm curious why this is happening.. I wasn't hitting my shackles on rocks or anything.. one observer said that the shackle flipped when I was under flex and when I would turn the steering wheel..It would happen to either side.. sometimes both.. are my shackles or springs too long/short? i'm sure I can remedy the problem w/anti-kickback shackles, or just welding a plate far enough behind the shackle, to keep it from flipping back.. I was curious why this was happening.
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post #2 of (permalink) Old 04-14-2002, 07:47 PM
 
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Re: What induces \"shackle inversion\"?

I had this happen to me a few years back. With new springs the arch took up some of the travel in the stock shackle causing it to ride more of a center line straight up and down. Stock shackles should be kicked forward to allow the spring to flex and the shackle to travel with out going over center. Buy having the arch in the spring this effectivly shortens your shackle letting it ride more to the center line,(straight up and down) when the spring flexes it flips back or inverts. Did you get the right springs for your Jeep, or are they installed correctly. I 'm assuming this is on a new install.
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post #3 of (permalink) Old 04-14-2002, 11:17 PM
 
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Re: What induces \"shackle inversion\"?

This happens to my jeep ocasionally on the rear. With a good flex and a little spring wrap, the shackle flips forward. It usually flips back during the next flex.
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post #4 of (permalink) Old 04-14-2002, 11:40 PM
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Re: What induces \"shackle inversion\"?

If this is a problem then either:

1. Your shackles are too short for the amount of flex you have....or.....
2. Your shackle-to-frame mount is too far away from the fixed spring eye frame mount.

-remy
post #5 of (permalink) Old 04-15-2002, 04:31 PM
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Re: What induces \"shackle inversion\"?

That's common on the OME's, I've seen it many times. You'll need to relocate your front and shackle hangers to prevent them from doing that. Otherwise it'll keep doing it and eventually bend the main spring. Seen that too often too. Here is a set, SOA on a YJ, that are inverted. Kinda a PITA having to get out the crowbar every time it's flexed up.

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post #6 of (permalink) Old 04-15-2002, 07:50 PM
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Re: What induces \"shackle inversion\"?

Thanks for all the info guys! Do you think I can just get a set of MORE's anti-kick back shackles to alleviate the problem? (seems to me to be the cleanest/easiest solution)..
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