jeep yj boomerang shackles? - JeepForum.com

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post #1 of 16 Old 05-24-2011, 06:13 PM Thread Starter
jeepyj13
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jeep yj boomerang shackles?

this maybe a noob question but i currently have a 4" lift from RC on my jeep which is almost 2months old. thinking about trying to gain more clearance by buying a set of RC 1" boomerang shackles. now i have been hearing on the forum that aftermarket shackles may cause premature spring sag. i may still buy some shackles but is this true will they compromise the spring strenght? oh with people running lift shackles(like 1 inch) with a 4" lift of any brand RC, procomp, skyjacker etc. do you experience driveline vibs w/ the setup? i knw every jeep behaves different but just want to knw. thanks


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post #2 of 16 Old 05-24-2011, 06:21 PM
98NVXJ
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In my experience, the extended shackle did increase the rate at witch the spring sagged, but only slightly. As far as compromising the spring strength I did not notice anything. I could still tow my 2 Jet Skis with the Jeep fully loaded or play in the rocks just fine. I am currently running the 4.5" RC on my XJ with a 1" or 2" shackle(can't remember anymore) and I don't feel that there is any harm in doing so. And like you said every jeep behaves different with different setups, but I have not had any vibes because of the shackle. It is more overall hight and pinion angle. Also the YJ vs. XJ plays a part in the vibes department so you may get them.

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post #3 of 16 Old 05-24-2011, 06:21 PM
MLJeeper
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Excessively tall shackle lifts can trash your springs. Usually, people recommend 1" or less. So you should be good. Personally i like to keep them around a half inch lift, ie 1" longer. Not into the Count Shackula look.

Your limited slip differential sucks.

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Any video of the sound?
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post #4 of 16 Old 05-24-2011, 06:23 PM
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Quote:
Originally Posted by 98NVXJ View Post
In my experience, the extended shackle did increase the rate at witch the spring sagged, but only slightly. As far as compromising the spring strength I did not notice anything. I could still tow my 2 Jet Skis with the Jeep fully loaded or play in the rocks just fine. I am currently running the 4.5" RC on my XJ with a 1" or 2" shackle(can't remember anymore) and I don't feel that there is any harm in doing so. And like you said every jeep behaves different with different setups, but I have not had any vibes because of the shackle. It is more overall hight and pinion angle. Also the YJ vs. XJ plays a part in the vibes department so you may get them.
Another thing to consider is they can affect his steering. Again not usually an issue on 1" or less shackle lifts though.

Your limited slip differential sucks.

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Any video of the sound?
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post #5 of 16 Old 05-24-2011, 06:24 PM
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Going with 1" over shackles will do just that... put your Jeep 1" higher. This will change your d-line pinion angle. This may or may not cause vibes. It depends on how your d-line is set up currently. Most likely an adjustment will need to be made by using shims, a MM lift, or re-setting the pinion angle via the perch.



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post #6 of 16 Old 05-24-2011, 06:25 PM
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i have the 4inch rc lift and i inch boom shackles and vibration wise i did feel a difference but only when slowing down hard. After it hits 30 and below u can feel the vibs but just normal driving and cruising are just fine not really anything different

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post #7 of 16 Old 05-24-2011, 06:27 PM
Chris Aunchman
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If anything I wouldn't go more than 3/4" lift shackles, even 1/2". It screws up alot of your driveline angles. I just don't like the look of taller shackles either.
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post #8 of 16 Old 05-24-2011, 07:03 PM
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If your rear shackles are not binding on the rear cross member booms will do nothing to increase travel.
If the shackle is hitting the rear cross member you can knotch the cross member to gain more clearance.
Booms are not some fantastic will make your rig into a unstoppable mighty machine as some would tell you. They were designed to clear the rear cross member and customers have found that they can help prevent spring inversion on the front also by blocking the backwards travel of the shackle.

Dwayne
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post #9 of 16 Old 05-24-2011, 08:23 PM
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Quote:
Originally Posted by 4.7stroker
If your rear shackles are not binding on the rear cross member booms will do nothing to increase travel.
If the shackle is hitting the rear cross member you can knotch the cross member to gain more clearance.
Booms are not some fantastic will make your rig into a unstoppable mighty machine as some would tell you. They were designed to clear the rear cross member and customers have found that they can help prevent spring inversion on the front also by blocking the backwards travel of the shackle.

Dwayne
Dwayne
You forgot to mention that they look cool.
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post #10 of 16 Old 05-24-2011, 08:32 PM
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You forgot to mention that they look cool.
Umm yea. I do not drop hard earned cash on shizzle that sounds or looks cool, I drop cash on stuff that has a positive impact on capability or performance.

Dwayne
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post #11 of 16 Old 05-24-2011, 09:50 PM
raynmaker
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would revolvers be a better idea?

Warning: This poster has infinite knowledge of useless information and redneck tendencies. Use info at your own discretion. :wave:
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post #12 of 16 Old 05-24-2011, 10:07 PM
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Quote:
Originally Posted by 4.7stroker View Post
Umm yea. I do not drop hard earned cash on shizzle that sounds or looks cool, I drop cash on stuff that has a positive impact on capability or performance.

Dwayne
I tell people I have greasable boomerang shackles because they looks cool all the time...Most people don't know what you mean when you start talking about shackle inversion and crossmember this and that.

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post #13 of 16 Old 05-25-2011, 08:50 AM
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post #14 of 16 Old 05-25-2011, 10:36 AM
Destr0
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Just to echo all the comments here-
I run 3/4" lift shackles and did notice an increase in ride quality- mostly because the PO had torqued down the shackles with the hand of God tighness and when I put in the booms I went with 60 ft/lbs.

I also think they look cool. I wanted a bit more clearance so 3/4" shackles fit the bill and booms look cooler than straight, plus they were just as easy to make (I did the DIY boomerang thing because I have a CNC controlled plasma table at work).

~Kevin

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post #15 of 16 Old 06-16-2011, 07:45 PM Thread Starter
jeepyj13
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well i finally pulled the trigger on a set of 4 RC 1" boom shackles. my current rocker height is alittle over 23" but only cause i have a hardtop and the 4.0L engine which really weighs the springs. so hope the shackles help out. thanks for the advice though

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