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Again.... please explain what force is acting on the axle housing!!??? Gnarls.
I just wanted to give an update, I put longer shackles on without doing anything to the front spring hanger and it changed my pinion angle way more than I thought it was going to, now I have a bad vibration in 4x4 so Iím either going to shim it or weld in a longer front hanger... probably going to shim it
I am not trying to be contentious or argumentative but I do try to be FACTUAL.So Ö. When I raised my Ď85 shortbed with a different leaf spring pack in the front and the back and installed a longer shackles in the rear. As I remember it was about 3.5Ē to 4Ē lift. The rear pinion angle DID NOT CHANGE after installing rear springs. BUT because the lift changed the U-joint angles, I had a little drive shaft vibration Ė I NEEDED TO CHANGE THE PINION ANGLE. So I added wedges under the bottom spring to make an adjustment which eliminated the vibrations caused by the out of sync angles of the front and rear U-joints. I have spoken to 5 manufacturers about their leaf springs, pinion angles, and U-joint angles.You can do your own research. If you call Charlie at Rocky Road Outfitters in Utah, who sells Old Emu suspension springs and kits, he will happily explain when and how the pinion angle changes. Heís been around 4x4s for a long time and sells to popular 4-wheel drive vehicle owners who are modifying their suspensions.If the arc of the bottom leaf that mounts to the housing pad is increased enough it can change the angle of the pinion, BUT the amount that it changes is not typically an issue for common non-radical lifts, but it should be a consideration because of potential U-joint angles becoming out of sync.Gnarls.
You are going about this wrong, and creating issues where you didn't have any. Other than cosmetics, there was nothing wrong with the slight rake of the rear, a rake that would have been been there if the stock springs weren't 39yrs old. If you can't live with the rake of the rear, or the ride is too stiff, you should rework the rear springs, not be trying to raise the front.If the old man emu springs use a longer main leaf, I would start by removing the old man emu main, and replace the stock main with it, or cut the eyes off the stock main leaf and use the full stock set with new old man emu main, and bolt up the springs and see what you get. From there, if you need more lift, add the next longest old man emu leaf, pack where it fits by size, or replace one of the stock springs if it is the same size, and bolt then back up. Repeat process, mixing and matching until you get the height you want. This could be more work than a quick fix, but it would be the correct way to resolve the issue, and not effect pinion angles nor driveline angles other than the slight increase due to the 2" lift springs.
Iím buying everything I need to do high steer in a couple weeks and after I install it if I can drop the springs back down to the original shackle height thatís the route I will go otherwise Iím going to temporarily shim it and then when I get a chance Iím going to just replace the front springs for the appropriate height
Yeah I agree with everything youíre saying but this is actually trying to fix a previous problem which is I shouldnít have ever bought the old man emu springs because I want to do a high steer conversion but I donít think I can fit it under a 2Ē lift looks like I need over 3Ē at least but honestly with these big shackles it now looks like I have 3 1/2Ē or so but maybe I should just buy different springs which kind of sucks cause I spent a lot of money on these but Iím kind of new to all this so I figure itís all just part of the learning experience
Because your front axle is not centered, eye-to-eye, on the spring, as you add length to the shackle you rotate the pinion down. This small movement adds to the u-joint angle and caster in a small way depending on the length of the shackle. You don't need to ad shackles to the front but taking a leaf out of the rear packs is a good idea. Unless you carry loads in your bed all the time and just use your truck with the bed empty, Heavy Duty springs are way over what you need and you will always be a$$ high with a rough ride. Your pinion angles with a 2-3" will not affect the pinion angle enough to be a problem. And, you need at least a 4" lift to run High-Steer, Sorry. The rear pinion angle won't change unless you add longer shackles or a wedge.
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