1/2" lift shackles effect on steering? - JeepForum.com
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Unread 07-06-2013, 01:28 AM   #1
cyoos
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1/2" lift shackles effect on steering?

I'm getting ready to install a 2.5 OME lift on my YJ. I have two sets of heavy duty shackles; one is standard 4", the other is 5" boomerangs.

I'm wondering how much the 1/2" lift booms will effect my steering. I read numerous threads on different forums, but haven't found anything that would pinpoint this answer. I realize that the small shackle lift will change the caster angle, but I'm hoping to hear from voices of experience with similar suspension setups.

Does the slight lift throw the caster off enough to install caster shims?

Return to center?

Bump steer and wander?

I'll be running 31's or 32's (with body lift) if that has any bearing on it.

All input wil be appreciated.

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Unread 07-06-2013, 05:33 AM   #2
rogerv
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I ended up having to put a small shim in mine when I went to 1/2" booms. My 89 also has a 4" lift, running 31's. I also threw away the trac and sway bar. The return to center was effected slightly, but driving down the road without the shims was greatly improved after I put shims in. Play with the torque on your shackle bolts, took me a few times to find its sweet spot, but don't over tighten them.
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Unread 07-06-2013, 06:01 AM   #3
dillonjm
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It will be slightly lighter, but if you don't have any loose components to begin with it'll be just fine.

I tried out a few different shackle configs in my YJ and found I liked the 1/2" booms the best.
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Unread 07-06-2013, 07:15 AM   #4
cyoos
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Thank you.

I've also been playing with the thought of simply trying both sets to see where it got me. That in itself still may not be a bad idea, but the standard set was shipped to me by accident after I had already received the 5". So it's put me in the unique position of trying to decide which set to send back, or sending payment for the standards and trying out both sets.
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Unread 07-06-2013, 07:51 AM   #5
UZI4U
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Kind of a side question...where do you get 1/2" lift boomerangs for the front? All of the places I see advertise them as being for the rear only.
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Unread 07-06-2013, 07:57 AM   #6
rogerv
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UZI4U- I got mine from Ground Pounder Fab. The owner is a forum member over in the CJ section. Excellent product for the money.
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Unread 07-06-2013, 08:02 AM   #7
Siva283
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Originally Posted by rogerv View Post
UZI4U- I got mine from Ground Pounder Fab. The owner is a forum member over in the CJ section. Excellent product for the money.
Also there is no difference between front and rear shackles.
And another vote for ground pounder.
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Unread 07-06-2013, 08:10 AM   #8
cyoos
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Also, the torque on the shackle bolts is the one point that was stressed in all of the threads I read. Most were using 40-45 ft-lbs on them, and around 60 on the frame bolts as I recall.
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Unread 07-06-2013, 08:15 AM   #9
cyoos
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I got mine from Jim Crabtree, Crabtree Tool & Die, in Perry, MO.

From what I've read the front shackles are installed short leg up, whereas the rear shackles are mounted long leg up. The "V" on both ends point inward to the center of the Jeep.
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Unread 07-06-2013, 12:52 PM   #10
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Quote:
Originally Posted by cyoos View Post
Also, the torque on the shackle bolts is the one point that was stressed in all of the threads I read. Most were using 40-45 ft-lbs on them, and around 60 on the frame bolts as I recall.
Keep in mind that quote is for locknuts. Standard nuts/washers can re-loosen at the lower torque settings.




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Unread 07-06-2013, 02:59 PM   #11
cyoos
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Originally Posted by RockWoRM View Post
Keep in mind that quote is for locknuts. Standard nuts/washers can re-loosen at the lower torque settings.




WRM
Correct! Thanks for adding that.
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Unread 07-06-2013, 11:33 PM   #12
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I use 3/4" front and rear. stock pitman. no shims. no bumpsteer at all, steering return to center on it's own.
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Unread 07-13-2013, 11:59 PM   #13
cyoos
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It sounds like it's holding true that no two Jeeps react alike. In that case...EXPERIMENT!
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Unread 07-14-2013, 12:03 AM   #14
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Yes its true that every jeep is different but its a universal truth that longer shackles exacerbate existing problems more than create their own. Go up to an inch lift if everything else is squared away.
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Unread 07-14-2013, 12:42 AM   #15
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I run 1/2" booms with my ome springs. Everything seems to work great. I'm going to throw out BESRK for shackles. Pm him here on the boards. You won't find a better price, he is awesome to deal with, his product is great, and shipping is quick.

Cheers
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