Shackle flip complete
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Record Breaker
Joined: Feb 2009
Posts: 1,145
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From: Amarillo, Texas
Ok, here are some pics.
I mean, it didnt raise up enough to arch it an inch forward. It raised a maximum of two inches, the length of your thumb. How could that small amount move it over an inch forward. I can believe it with a 6" raise, but not two. Its impossible.
I mean, it didnt raise up enough to arch it an inch forward. It raised a maximum of two inches, the length of your thumb. How could that small amount move it over an inch forward. I can believe it with a 6" raise, but not two. Its impossible.
Administrator
Joined: Apr 2010
Posts: 87,397
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From: Clayton MI
Anyway.....
The axle, if given free reign, would rotate in a circle, about the front leaf spring mount, Radius would be distance from the center of the spring mounting bolt, to the center of the axle. On mine, that is 28 inches. That will yeild a circle with a circumference of approximately 175.84 inches. If the axle rotated 90 degrees, (hanging approximately directly below the mount, it would travel about 25% of that distance, or 43.96 inches. That would yeild 28 inches of forward travel. We are only moving the axle (in this particular case.....) 1.5 inches...... So, rounding the 43.96 to an even 44, just for ease of calculations, we have a ratio of rotational movement, to forward movement, of 44:28, or, reducing that, 11 inches of rotational travel, will yeild 7 inches of forward travel. Solving that gives us a whopping 1.04 inch forward travel. So, technically, I suppose you are right. The math is not exact though, so the "real" number is going to be less than that, but, not a hell of a lot.
In reality though, this is still in the NORMAL travel of the axle. It isn't any closer to anything it is going to hit, nor is it going to get any closer to anything than it did before the flip. The only thing that has changed, is where the axle sits 'normally'. Load it up, and the axle will STILL travel in the EXACT SAME arc it did before the flip.
Professional
Joined: Jan 2011
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Quite a few actually. Not like I was a mechanic for a living or anything.
Anyway.....
The axle, if given free reign, would rotate in a circle, about the front leaf spring mount, Radius would be distance from the center of the spring mounting bolt, to the center of the axle. On mine, that is 28 inches. That will yeild a circle with a circumference of approximately 175.84 inches. If the axle rotated 90 degrees, (hanging approximately directly below the mount, it would travel about 25% of that distance, or 43.96 inches. That would yeild 28 inches of forward travel. We are only moving the axle (in this particular case.....) 1.5 inches...... So, rounding the 43.96 to an even 44, just for ease of calculations, we have a ratio of rotational movement, to forward movement, of 44:28, or, reducing that, 11 inches of rotational travel, will yeild 7 inches of forward travel. Solving that gives us a whopping 1.04 inch forward travel. So, technically, I suppose you are right. The math is not exact though, so the "real" number is going to be less than that, but, not a hell of a lot.
In reality though, this is still in the NORMAL travel of the axle. It isn't any closer to anything it is going to hit, nor is it going to get any closer to anything than it did before the flip. The only thing that has changed, is where the axle sits 'normally'. Load it up, and the axle will STILL travel in the EXACT SAME arc it did before the flip.
Anyway.....
The axle, if given free reign, would rotate in a circle, about the front leaf spring mount, Radius would be distance from the center of the spring mounting bolt, to the center of the axle. On mine, that is 28 inches. That will yeild a circle with a circumference of approximately 175.84 inches. If the axle rotated 90 degrees, (hanging approximately directly below the mount, it would travel about 25% of that distance, or 43.96 inches. That would yeild 28 inches of forward travel. We are only moving the axle (in this particular case.....) 1.5 inches...... So, rounding the 43.96 to an even 44, just for ease of calculations, we have a ratio of rotational movement, to forward movement, of 44:28, or, reducing that, 11 inches of rotational travel, will yeild 7 inches of forward travel. Solving that gives us a whopping 1.04 inch forward travel. So, technically, I suppose you are right. The math is not exact though, so the "real" number is going to be less than that, but, not a hell of a lot.
In reality though, this is still in the NORMAL travel of the axle. It isn't any closer to anything it is going to hit, nor is it going to get any closer to anything than it did before the flip. The only thing that has changed, is where the axle sits 'normally'. Load it up, and the axle will STILL travel in the EXACT SAME arc it did before the flip.
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Joined: Apr 2010
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From: Clayton MI
The wheel moves forward just shy of an inch. Question from me becomes, what is bad about that? Is driveshaft length changing? Is pinion angle doing anything it wouldn't normally do if the suspension traveled that far? Is NOT re-centering the axle going to cause him trouble in the future?
The answer to ALL of those questions is "No."
So, ok, you were right. The axle moved about an inch. That's nice. So, aside from esthetic value of "appearance", why is re-centering so bloody important to you?
Professional
Joined: Feb 2011
Posts: 151
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From: Mentor, OH
It makes logical sense if you think about it. How could it possibly move the axle forward an inch off center if the axle has never moved in the first place? How is this any different than jacking up your truck and allowing it to hang on the jacks? It's going to look the same way, at least I know my truck did. I agree with HeyYou, when he hits a bump the axle will still follow it's normal arc, it's not going to bump into the cargo box.
So, let's quit feeding the troll who's obviously got something against the shackle flip.
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Joined: Jan 2011
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Have nothing against a shackle flip actually its a better way to gain lift and flex out of the rear. But if your going to do something do it correctly. His pinion angle is off by 5-6 degrees and a zero rate with do both move the axle back and correct the angle. IF you dont correct this you will have pinion problems down the line. Your analagy of jacking up the rear is bs. Your lifting both shackles not just the rear so try again lmao. Its up to the op if it wants to do it correctly or not. Its like installing any lift on the front. If you dont replace the lower control arms and deal with the track bar then its an automatic fail. Typical DF.
Last edited by tweeker909; Mar 31, 2011 at 05:01 PM.
Professional
Joined: Feb 2011
Posts: 151
Likes: 0
From: Mentor, OH
Have nothing against a shackle flip actually its a better way to gain lift and flex out of the rear. But if your going to do something do it correctly. His pinion angle is off by 5-6 degrees and a zero rate with do both move the axle back and correct the angle. IF you dont correct this you will have pinion problems down the line. Your analagy of jacking up the rear is bs. Your lifting both shackles not just the rear so try again lmao. Its up to the op if it wants to do it correctly or not. Its like installing any lift on the front. If you dont replace the lower control arms and deal with the track bar then its an automatic fail. Typical DF.