Tech topic: Boomerang Shackles - Page 2 - JeepForum.com

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post #16 of 36 Old 10-09-2012, 08:33 AM
zte87
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Quote:
Originally Posted by jeepster93

I am aware of the stuff I have attached to the frame crossmember. The darn thing(crosmember) almost fell off. The bumper/tire carrier is heavy and just about pulled the thing apart. So I got some reinforcements and welded and bolted them to the bumper and frame. This will effect the shackle's movement, I know this. I can hear it bang on the frame, so I know of the issue.
Also thought of cutting the military wrap from the rear springs, it has been suggested to me.

So...
What do you sugest?
I am open...to better ways. I would love more suspension movement.
I cut off the wraps on one side off all 4 springs (like the re springs) and it made a big difference in droop! I was hesitant on doing mine but am glad I did!

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post #17 of 36 Old 10-09-2012, 10:52 AM
cbl600r
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Where do I get some of these vac booms?
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post #18 of 36 Old 10-09-2012, 11:00 AM
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Originally Posted by cbl600r View Post
Where do I get some of these vac booms?
Pm the thread starter.
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post #19 of 36 Old 10-09-2012, 11:08 AM
murilstone
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so, what about the center bolt....what if you just leave it out?
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post #20 of 36 Old 10-09-2012, 11:36 AM
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its fine to leave out.

yep trimming the wrap is important. make sure to round the ends as the sharp corners will gouge the shackle/spring hanger.

i dont particularly like bumpers that have tire carriers so id pull all that stuff off the back of your jeep. if the crossmember is bad id cut it out and weld in a new one or a piece of rectangle tubing. if you have to have that bumper remove the cross member and weld it right on the framerail.

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post #21 of 36 Old 01-12-2013, 11:11 PM
gfd66
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I've got a shackle reversal kit on the front of my YJ. Would the Booms be beneficial for my application or only use them for the rear springs?

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post #22 of 36 Old 01-12-2013, 11:34 PM
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Quote:
Originally Posted by gfd66 View Post
I've got a shackle reversal kit on the front of my YJ. Would the Booms be beneficial for my application or only use them for the rear springs?
I have seen someone use booms on their shackle reversal however you lose most of the risk of inversion when you have the reversal. I would think just the rear would be worth it, but I can't speak from experience.

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post #23 of 36 Old 02-22-2014, 03:10 PM
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My RH front shackle has inverted on me a few times. thankfully, the main leaf still appears to be (not) bent. I keep in touch with the previous owner; says he never experienced that. The shackles sit perfectly vertical when jeep is on flat ground. Someone recommended boomerangs for the front, but I fail to see how this would cause the angle go change without a longer main leaf.
What do you guys think?
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post #24 of 36 Old 02-22-2014, 03:22 PM
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Quote:
Originally Posted by newfish1
My RH front shackle has inverted on me a few times. thankfully, the main leaf still appears to be (not) bent. I keep in touch with the previous owner; says he never experienced that. The shackles sit perfectly vertical when jeep is on flat ground. Someone recommended boomerangs for the front, but I fail to see how this would cause the angle go change without a longer main leaf. What do you guys think?
Vertical shackles at ride height is not right.

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post #25 of 36 Old 02-22-2014, 07:35 PM
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great thread answered all my stupid questions without me having to ask
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post #26 of 36 Old 02-22-2014, 09:56 PM
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Question: I had rubicon express springs ( non military wrap) but the main leaf snapped (not from re quality I'm sure, just from lots I über flexing and me hitting a jump too hard. I replaced with BFD springs, military wrap, but they seem to really limit flex. Since they are new, should I cut the front wrap like in a previous post, for more flex seeing thy should e less likely to break or should I leave it as is? I don't want to break another spring, or have to carry a spare, but I do want more flex. I am Soa.
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post #27 of 36 Old 02-22-2014, 11:18 PM
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Quote:
Originally Posted by newfish1 View Post
My RH front shackle has inverted on me a few times. thankfully, the main leaf still appears to be (not) bent. I keep in touch with the previous owner; says he never experienced that. The shackles sit perfectly vertical when jeep is on flat ground. Someone recommended boomerangs for the front, but I fail to see how this would cause the angle go change without a longer main leaf.
What do you guys think?
The bolt that goes through the elbow of the shackle in the middle will hit the frame first and allow your springs to continue forward instead of flipping flat against the frame.

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post #28 of 36 Old 03-31-2015, 05:35 AM
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I'm about to get new springs, along with some M.O.R.E. 5/8" boom shackles. I noticed that they come with grade 5 greasable bolts. I wish that i could find grade 8 greasable bolts. Could someone tell me what their feelings are about grade 5 greasable bolts vs. grade 8 regular bolts?

Thanks!

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post #29 of 36 Old 03-31-2015, 06:00 AM Thread Starter
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The shear strength between a standard grade 5 and a grade 8, 1/2" diameter bolt is roughly 3500-4000 lbs depending on what source you dig up. However, the grade 5 has a shear strength of something around 15,000 lbs. which is nothing to shake a stick at. BUT! In my opinion (what the heck ever that's worth)... the fact that they drilled a hole down the center of the bolt reduces the strength of the bolt and thus creates a failure point. Even then... I don't know many guys who shear leaf spring bolts. There is too much give in other things like the bushings, the springs themselves etc... If it were a solid mount where forces were transferred directly to the bolt, then I would worry more about shearing.

Greasable bolts are nice if you actually grease them... I ran some for a while when I was running poly bushings to keep them quiet. Then I caught the zerk fitting on a rock and sheared it off... whoops. I like rubber bushings, they may not last as long but they ride better and are quieter.

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post #30 of 36 Old 03-31-2015, 08:28 AM
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I break stuff like greasable bolts


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