Fabtech 3.5" Springs Install Question - JeepForum.com

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post #1 of 30 Old 08-08-2012, 02:56 PM Thread Starter
Supertrey
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Fabtech 3.5" Springs Install Question

First, if you are looking for 3.5" springs, Amazon has these Fabtech leafs for just under $60 each. This is a great deal as far as I could find!

I have the rear put back together, springs installed, degree shims turned the correct direction (they are preinstalled on these when you buy them) and everything tightened up.

I took measurements in several places around the Jeep from the ground to have a reference point to where I ended up, and to be able to measure any sag over time.

When I put the tires back on and took it off the jackstands, the new measurement is exactly 6" taller than where I started!! I climbed in the back and jumped up and down, and the shackles seem to be moving freely. I haven't finished the front yet, I should have it done tonight or tomorrow.

So my question is, do the springs break in after a little use? Do they settle out to the 3.5"?


1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #2 of 30 Old 08-08-2012, 03:42 PM
richharr
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How loose are the shackles? If you tightened them too much while it was jacked up it wont sag to the right hight when you put it down

93 4.0l 5 spd, 33s 4" lift
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post #3 of 30 Old 08-08-2012, 03:53 PM Thread Starter
Supertrey
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I have locknuts, and used the suggestion of tightening until the bushing begins to squeeze. I will loosen them then retorque them tonight and see if that works.

I found torque specs for lock nuts to be 40 ft/lbs at the shackle end and 50 at the frame end. Is this correct?

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #4 of 30 Old 08-08-2012, 07:14 PM
Homebrewed2
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I just ordered a set of springs for mine of amazon. The lift kit runs over $800, $60 a spring is not bad at all. Thanks for the heads up I will let you know how mine sits when I get them on.
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post #5 of 30 Old 08-08-2012, 08:17 PM
Hghgrad
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I ended up with about 5.5" of lift at first with the same springs. After almost a year, they might have settled down to about 4.5" now. I like the , did the same thing on amazon, put the whole lift together for like $400.

1994 Wrangler...4.0 AW4 swapped, sye'd, 5.5" lift and 33's
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post #6 of 30 Old 08-08-2012, 09:10 PM Thread Starter
Supertrey
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Quote:
Originally Posted by Homebrewed2 View Post
I just ordered a set of springs for mine of amazon. The lift kit runs over $800, $60 a spring is not bad at all. Thanks for the heads up I will let you know how mine sits when I get them on.
Great, thanks.

I did loosen and retorque the shackles, that seemed to free up the suspension movement alot. But it didn't settle out any.

I guess we bought 3.5" springs and got an additional 2" for free! That makes it an even sweeter deal!

Now I need bigger tires.........

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #7 of 30 Old 08-08-2012, 09:28 PM
Hghgrad
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Here's mine with 33's... This is without the hard top, which doesn't seem to drop it down any further.


1994 Wrangler...4.0 AW4 swapped, sye'd, 5.5" lift and 33's
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post #8 of 30 Old 08-08-2012, 10:02 PM Thread Starter
Supertrey
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I am running 31s, and I have the back finished and on the ground. They are looking a little small for this much lift!

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #9 of 30 Old 08-08-2012, 10:29 PM
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Here is my jeep with the fabtech 3.5 springs! I am running 5/8 shackles to clear the military wraps, I also have 1.25 bl to tho! After wheeling a bunch and throwing a ford 8.8 out back I have sagged bit! I am running 33's! The last pic was the jeep with out the bl!

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post #10 of 30 Old 08-08-2012, 10:36 PM Thread Starter
Supertrey
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Quote:
Originally Posted by zte87 View Post
Here is my jeep with the fabtech 3.5 springs! I am running 5/8 shackles to clear the military wraps, I also have 1.25 bl to tho! After wheeling a bunch and throwing a ford 8.8 out back I have sagged bit! I am running 33's! The last pic was the jeep with out the bl!

Sent from my iPhone using JeepForum
Thanks for the pics! And I just saw your reply to the PM!!

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #11 of 30 Old 08-09-2012, 08:26 AM
snag
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thanks for the heads up thats a good price on the springs (free shipping too). ordered 4 for my yj
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post #12 of 30 Old 08-09-2012, 08:40 PM Thread Starter
Supertrey
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Originally Posted by snag View Post
thanks for the heads up thats a good price on the springs (free shipping too). ordered 4 for my yj
Awesome! Everything I read says they are great springs.

I should be finishing my install up this weekend. I will report back to what the height is after driving it around some.

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #13 of 30 Old 08-27-2012, 07:38 PM Thread Starter
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So it looks like I'm sitting about 4.5" taller than before the lift springs. It helped a lot when I set the jeep on all 4 wheels instead of having the back on the ground and the front on jack stands.

I got a pm about the bushings, thought I would post what I had to do. The Fabtech springs use the 1.5" od bushing on the shackle end, same as the main eye end. The steel sleeve that goes in the middle of the bushing has the same od on both ends, but a smaller id on the shackle end. I just put on new polyurethane bushings at both ends of my stock springs a few months ago, so I only needed the shackle ends. I found a good price at WFO Concepts. I didn't need a set since I already had the sleeves and the main eye bushings. Here is the link: http://www.wfoconcepts.com/pr/YJ-Lar...4-ID/3190/3484

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #14 of 30 Old 08-27-2012, 08:41 PM Thread Starter
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I had some pretty severe driveline vibrations once the springs were installed. I have a 1" mml already, so I tried the transfer case drop. Still had the vibes. Also, as you guessed, the transfer case end of the driveshaft had a significantly less amount of engagement in the slip yoke.

I decided I needed to go ahead and do and SYE and CV driveshaft, so, after some research both here and at google, 2 names surfaced, Tattons and Adams Driveshaft. Both offered kits that included the SYE and the driveshaft. I bought the Adams kit from their BallisticJeep.com website (http://www.ballisticjeep.com/buy_online). It will be here tomorrow. Once I install, I will post an update.

1992 YJ, 4.0L with 1" MML and stock drive train with AX15 and 4.10 gears, 3.5" Fabtech leaf springs, 1" BL, 31" Buckshot XMTs, Softtopper, Ford Ranger Bench seat, Metal Cloak Overlines and Genright rear flares, 1" M.O.R.E. Body lift, Lots of stuff in the works!
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post #15 of 30 Old 08-27-2012, 08:51 PM
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I just sold the springs I had. They rode like crap and flexed even worse. Yes, all the torques were correct but I just didn't have a good experience. zte87 has had good luck with them though.

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