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Old Rock Doc
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It depends entirely on where you located the hole in the frame relative to the spring eyes at normal compresion of the spring. There is no magic size or one-size-fits-all application. You need to measure it for your specific application. The first priority, IMO, is the optimal shackle angle. Length somes secondary.
 

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far spring - BAD
near spring - much better

(OLD pic, did this mod many moons ago....)

 

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texican said:
booty fab alert on Woody!!!!:rasta: :rasta:
HEY!! no peeking at my bootie! :flipoff2:
 

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If you run a stock length shackle with your mount through the frame I believe you will not have to run extended shackles in the rear. However a stock length shackle may be to short and limit the movement. So a extended shackle may be warranted.


alf
 

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megolfer said:
What size of shackles would be the best to run on the front with a shackle reversal. with the hanger in the back going through the frame.

Thanks

The shackle length required and to some extent the shackle angle is determined by the spring arch and how much compression and droop the springs have. You need to engineer it so that the shackle length does not limit the compression of droop. Flat springs are ideal because the eye to eye distance shortens on both compression and droop, which means that you can have a both a good shackle angle and the shortest possible shackle.
 
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