which way boomerang shackles? - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 03-11-2001, 11:23 AM
sas87yj
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which way boomerang shackles?

ok so no i never said i was an expert at this![img]/wwwthreads_images/icons/smile.gif[/img]- i may have the boomers on wrong- no thanks to any pictures or statements in the RE instructions! i did a search on this board and seems the correct way is the bottom dwg attached, with the "elbow" aiming UP and the long arm attached to frame. i currently have it mounted as shown in top dwg- elbow aiming DOWN with long arm to the frame. can someone verify this for me?
thanks,steve

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post #2 of (permalink) Old 03-11-2001, 11:43 AM
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Re: which way boomerang shackles?

I'm not expert here either, but looking at your "perfectly" drawn diagram it looks that it would help to have the elbows to be pointing up toward the frame as in the second diagram.. It seems it may act as a limiter? Like Anti- Kickback? Hey guys someone help him here..

<font color=blue> Muddynut </font color=blue>
<font color=red>[img]/wwwthreads_images/icons/cool.gif[/img] 78 CJ7 "Issues" </font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]
post #3 of (permalink) Old 03-11-2001, 12:03 PM
sas87yj
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Re: which way boomerang shackles?

thanks muddynut-
not that it makes it right but here is a pic which got me started to thinking. this is from http://www.rockcrawler.com on an article about this particular RE 4.5" lift. i read where it is to prevent travel restricted by the frame during compression. i am trying to figure if mounting the boomerangs one way or the other will effect the height of the lift and or the pitch of the pinion. i am trying some math now.[img]/wwwthreads_images/icons/smile.gif[/img]

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post #4 of (permalink) Old 03-11-2001, 12:18 PM
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Re: which way boomerang shackles?

If you were to mount the shackles like the lower of the drawings you will have increased droop which is what most people are after. If you mount then like the upper drawing you will gain more uptravel but they will most likely hit the rear bumper on a YJ. Hope that makes sense.
Travis

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post #5 of (permalink) Old 03-11-2001, 12:54 PM
 
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Re: which way boomerang shackles?

Mounting them either way will not increase 'droop' or spring compression.
The distance from the end holes remains the same no matter how crooked the path...
In most cases, their purpose is (bottom illustration) to prevent the end of the spring from getting stuffed and bound next to the frame forward of the hanger ...


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post #6 of (permalink) Old 03-11-2001, 01:01 PM
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Re: which way boomerang shackles?

jaffer-
i believe you are right and the only way to prove this analysis would be to take this problem to the shop and mount both ways,noting the results![img]/wwwthreads_images/icons/smile.gif[/img] take the office calcs and try in the field so to speak!
thanks, steve

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post #7 of (permalink) Old 03-11-2001, 01:14 PM
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Re: which way boomerang shackles?

the way i have it now

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post #8 of (permalink) Old 03-11-2001, 01:16 PM
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Re: which way boomerang shackles?

the proposed other way

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post #9 of (permalink) Old 03-11-2001, 01:21 PM
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Re: which way boomerang shackles?

The second diagram I believe is correct... it acts as a anti-kickback... as Jaffer says the droop is the same

<font color=blue> Muddynut </font color=blue>
<font color=red>[img]/wwwthreads_images/icons/cool.gif[/img] 78 CJ7 "Issues" </font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]
post #10 of (permalink) Old 03-11-2001, 09:42 PM
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Re: which way boomerang shackles?

Your bottom drawing is the correct mount (per Currie) position. My stock rear shackles bottomed on the frame during compression and this position puts the spring eye past the rear cross member. Now I'm stuffing past the bump stops.

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