How quickly will longer shackles prematurely compress leaf springs? - JeepForum.com

 
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post #1 of 7 Old 12-01-2010, 08:46 PM Thread Starter
andrewmacc
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How quickly will longer shackles prematurely compress leaf springs?

Running a crappy 4.5" Rough Country lift at the moment. And by crappy I mean it's using TJ control arms.

Anyway. I'll be buying a friend's set of 35"x12.5"x15" Mud Countrys off a friend's Ranger. I've trimmed the front pretty extensively (hopefully I'll go all out and have a welder friend help me cut out and re-sheet metal the inner wells for more steering flex clearance), and the rears very soon.

As a little Christmas present, I'm thinking of 2" shackles and 2" coil spacers, just to gain a little clearance a la:


http://www.twiztedengineering.com/se...herokee/Detail

and

(2.25" spacers)
4 Wheel Customs - 2.25" Jeep Coil Spring Spacers (pair)

or
(the 2" poly spacers at the bottom)
Cherokee ACOS, Adjustable Coil Spacer kit



Now, the important question. Will shackles that long prematurely compress my leaf packs to a sad state of sagginess quickly? They seem like a pretty good arch, but will the shackles kill them within a short amount of time or what?

Many thanks in advance.


OH, and extra question: will the 2.25" spacers or the 2" spacers more likely to keep the heep level when used in conjuction with 2" shackles?


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post #2 of 7 Old 12-01-2010, 09:14 PM
Holder350
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Shackles do not wear springs out.

If you have a lift and have HD springs you could run blocks and be ok, the stock spings are the ones that are flimsy.

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post #3 of 7 Old 12-01-2010, 09:17 PM Thread Starter
andrewmacc
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Quote:
Originally Posted by Holder350 View Post
Shackles do not wear springs out.

If you have a lift and have HD springs you could run blocks and be ok, the stock spings are the ones that are flimsy.
I've heard from many sources that longer shackles will indeed cause leaf spring sag, I just don't know what that timeframe is...?

And you can bet your bottom dollar I'm not running blocks, though!

"Chilton's and Haynes are for brake jobs, oil changes and starting campfires." - CJ7-Tim
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post #4 of 7 Old 12-01-2010, 09:24 PM
Holder350
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Quote:
Originally Posted by andrewmacc View Post
I've heard from many sources that longer shackles will indeed cause leaf spring sag, I just don't know what that timeframe is...?

And you can bet your bottom dollar I'm not running blocks, though!
How per se would that work? They allow a longer range of travel....but you are not changing the spring rate nor the weight on the spring.

And I dont blame you for not running blocks. I wont even use them on full size trucks.

95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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post #5 of 7 Old 12-01-2010, 09:48 PM Thread Starter
andrewmacc
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Quote:
Originally Posted by Holder350 View Post
How per se would that work? They allow a longer range of travel....but you are not changing the spring rate nor the weight on the spring.

And I dont blame you for not running blocks. I wont even use them on full size trucks.
Hm. Sounds like I should do some research before I open my mouth.. figuratively speaking. I had assumed so because because of the nature of the length of the shackles increasing the angle, they would increase the vertical load on the edge of the leaf spring because the angle focuses the vehicle's mass downward onto the edges of the springs as opposed to spreading it both vertically and horizontally.
Perhaps I'm wrong, then!

Haha, yeah, if the last resort was to block it.. I'd just keep it as is. I have blocks on my full-size on 38"s, but the P.O. did that. Yuck..

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post #6 of 7 Old 12-01-2010, 10:54 PM
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do a shackle relocation braket in the rear and a 1.5 spacer up front....
the shackle relocation braket will boost you 1.5 in the rear and set your shackle at a better angle to get more drop from your springs
HD engineering makes a nice bracket

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post #7 of 7 Old 12-02-2010, 02:50 AM
CJ7-Tim
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Longer shackles will sag the stock springs. Good quality lift kit springs will be fine with longer shackles.

Be sure to use longer bump stops, over compressing (inverting) any leaf spring will quickly ruin it.

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