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Ford Truck Club Forum > GARAGE TALK > Garage Talk: Shop Class 101



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  #1  
Old December 16th, 2009, 01:46 AM
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Default Inches for Cheap, Reverse Shackle Flip

Reverse Shackle Flip



There are countless ways to gain lift in a leaf sprung truck, my examples are for the rear of a f-150 but the concept will work on any leaf spring suspension front or rear.The factory rear shackles attach near the bottom of the frame and extend upward to the rear of the spring, like the pic below:



The upgrade to this is to attach the the shackle low on the from extending downward to the rear of the spring.
These kits can be purchased for around $200 like this one:



You could fabricate your own from scratch or modify the stock mount like this one.
(This is kinda like what i did, but not as ugly ):



Also you could use OEM parts from other vehicles and such. This is a picture of a forward rear spring
mount used in the rear position to get the reverse shackle flip:

<br>
<br>
There are a few things to keep in mind when doing this:
  • For each inch that the rear eye of the spring is lowered you only gain 1/2 of actual lift
  • The pinion angle will most likely require adjustment after a flip, this can be done easily by using shims between the axle and springs
  • You can also adjust the length of the shackle to increase or decrease the lift you desire.
  • There are limits to how much lift you can gain and still have a functional suspension, 4" - 4.5" is a fairly safe max.
  • There are possibilities that a reverse shackle setup might increase axle wrap and slightly change your spring rate.



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Last edited by Old Blue; December 16th, 2009 at 07:11 PM.
  #2  
Old December 16th, 2009, 01:50 AM
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ah nice write up.

ive always wondered why ive never really seen anyone with a lifted F150 do this mod? its not really that hard to do.

i flipped the shackle on my little brothers ranger....to lower it :P haha

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Old December 16th, 2009, 02:03 AM
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Note: Doing this shackle decreases payload capacity.

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Old December 16th, 2009, 02:08 AM
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Quote:
Originally Posted by Klitch View Post
Note: Doing this shackle decreases payload capacity.
Disagree, many vehicles use this type of shackle system. Now if you use weak materials or make a 10" long shackles then yes it would be a problem. But done properly there should be no draw backs


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Old December 16th, 2009, 03:37 AM
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man I had a hard time finding something that was relevant... everyone wants to discuss flexibility or ride softness regarding a tension or compression spring setup...

Tension spring, whenever the shackle moves for up or down movement, the spring rate increases. the way I interpret this is spring rate increases, meaning payload is increased.

I really wish I documented the original source I found the information I remember the first time stating that tension achieves a higher payload than compression using the same springs.

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Old December 16th, 2009, 09:44 AM
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Ahh, i see what you mean... sure that would affect the spring rate some. Probably not a whole lot, depend alot on the angle of the shackle in relation to the spring.


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Old December 16th, 2009, 01:24 PM
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not sure if it was brought up but shackle flips also cause more axle wrap.


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Old December 16th, 2009, 06:57 PM
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Quote:
Originally Posted by DIXIE FIX View Post
not sure if it was brought up but shackle flips also cause more axle wrap.
ya some... probably not nearly as much a blocks though.


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Old December 16th, 2009, 07:12 PM
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There i updated it, check out the last line


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Old December 16th, 2009, 07:29 PM
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Quote:
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ya some... probably not nearly as much a blocks though.
depends on what size blocks.

The farmboy fabrications shackle flip is around 5.5" of lift. Im doing this to get rid of my block. And it will severly increase axle wrap. But it will also increase flex and ride softness.


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