Post 4" Lift Woes - Violent Braking & Rumbling

Modified FSJ Tech Area

sierrablue
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by sierrablue »

akguy09 wrote: Fri May 19, 2023 8:53 am Are the springs on backwards? I can't remember when I put my new 4" springs on in November if they were longer one way. I do remember there was a front orientation though.
I was wondering about this too. I know the stock ones on the '63-73s are 32" from either end, centered. I would think that orientation would be determined first by whether or not the pin is centered (and thus shift the axle front/back), and second by putting the bigger bushing in the mount directly on the frame, and the smaller one on the shackle side.

This is the first thing I would check; I personally wouldn't mess with the longer shackles.
'71 Wagoneer (DD)
-B350 (HEI, iron 4-barrel, Edelbrock 1406), TH400, D20
-'74 D44 front (nonpower discs)
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There are 2 major differences between new Wranglers and FSJs. FSJs are meant to be both utilitarian and capable, not just capable. FSJs are also rarely initially recognized as Jeeps by the average American.
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kjandb
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by kjandb »

I considered that but I think they're right. Bigger spring eye goes at the rear. That's what the Bj's instructions say but I'll call Deaver to confirm.

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'71 Wagoneer - 4" BJ's Leaf Lift - early 360 - Avocado Mist ???
S Idaho

Herk
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by Herk »

Longer shackles won't help correct the angle, they'll just make the issues with less than ideal angles more noticeable.
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Stuka
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by Stuka »

The spring orientation won't impact the shackle angle. The main leaf is either too short, or is over arched.
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

JWestfall
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by JWestfall »

Did you ever solve this shackle problem? Considering same springs for my 71.
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kjandb
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Re: Post 4" Lift Woes - Violent Braking & Rumbling

Post by kjandb »

Still unresolved and I haven't contacted Deaver yet. More of a winter project for me. I haven't noticed it settling in more but I also haven't put many miles on it. Good luck.
'71 Wagoneer - 4" BJ's Leaf Lift - early 360 - Avocado Mist ???
S Idaho
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