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- #101
You may not have enough shackle for a 4" lift. . Most 4" springs are at least an inch longer that a stock spring. You might damage the spring under compression or, at least, the spring may not fully compress when the shackle runs out of travel. Find the eye to eye specs on the Skyjacker leaf and compare it to stock. Ad the appropriate length to the shackle
I asked Dave (lcwizard) to elaborate on this. He actually did elaborate on it but it was in an email to me. I ordered a bumper from him (great product, I am very pleased) so since we were discussing the bumper by email, I asked him about this shackle angle question. For future reference and so that others might be able to find this with search function, here is his reply....
"....The length of the shackle has to accommodate the longer leaf pack. When you add arch to a spring the eyelets move in making the install difficult and leaving the shackles pulled in to an inverted position. Spring designers counter this by making the main leaf longer
to bring the spread of the eyes further apart at rest. How much longer depends on the guy who drew them up. You can call the manufacturer for the main leaf dimension, eyelet to eyelet. Your frame mounts for the spring are about 42" . A stock leaf is about 44"
and Toyota uses a 2 3/4" shackle. If you add the 42" frame measurement to the shackle length that's 44 3/4" If your leaf pack is an 1" longer a 1~2" longer shackle is fine. You want enough play as not to bind the spring in compression. You can measure the eye to eye
of the spring with a flexible tape...Sneak one from you wife's sewing kit....my wife still doesn't know what happened to hers...."
This makes really good sense. I always thought that people just bought extended shackles for lift. Now I know otherwise.
Thanks Dave! Pics coming soon of the 4 plus bumper.










. I have a 2.5" CCOT shackel in the rear already to level out the SBC engine. Any recommendations on front shackels ro "to shim or not to shim?" etc. Too bad about that new neighborhood off Paluxy. That lake/pond out there was a fun place to drive to.