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  #1  
Old 09-12-2017, 04:28 PM
ILivermore43 ILivermore43 is offline
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Default What is causing this? How should I fix it?

Okay so my lift setup in the back is FR34S springs with Belltech 6400 shackles. The tire is further forward in the wheel well than it is rearward. I think it's the shackles, but I've also heard it could be because of the wedge on the bottom of the leaf pack. Any Thoughts?

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  #2  
Old 09-12-2017, 04:40 PM
johnday johnday is offline
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Default Re: What is causing this? How should I fix it?

It's your shackles, a few guys are mentioning this lately. Mean olde Mr. Physics can be bad at times.
Look at your pinion angle, see how it's tilted nose up further than usuall? That's from the shackles too.
I like those Ions.

Did that spring pack come with tapered shims? Which way did you install them.
If you'd like, I'll take a photo of my pinion/differential angle tomorrow. I have a 2" lift with an AAL, stock shackles.
Regardless of which way you installed the shim, you'll still have the same problem with the axle moving forward. By using those shackles, the whole differential and spring packs are hinging on the frone spring perches, thereby hinging your axle forward.
With so many guys on here that do the shackle thing, you'd think even more on this would come up.
What's the right way? Throw those shackles away, and lift with either a tapered block, or better yet, an AAL.
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Last edited by johnday; 09-12-2017 at 05:35 PM.
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  #3  
Old 09-12-2017, 05:49 PM
JAMMANICA JAMMANICA is offline
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Default Re: What is causing this? How should I fix it?

Dude your pinion angle will vibrate like crazy please tell me you have a dual joint at the tranny or transfer case.

I agree with John it is the shackles, and I bet your tapered shims are backwards.

If you have a single joint on both sides you need to have pinion angle almost parallel with output shaft on tranny or transfer case to not vibrate.
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00 XLT 2WD RCSB 5.0 swap in progress.
98 XLT 4WD XCSB 4.0 dead
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  #4  
Old 09-12-2017, 06:36 PM
CalebJ CalebJ is offline
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Default Re: What is causing this? How should I fix it?

Fix the pinion angle, but don't spend too much time dreading the slightly forward axle position. The reason so few people are discussing the issue after all the shackle installs is that it just isn't a big deal. It's a minor cosmetic issue, not a functional problem.
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  #5  
Old 09-12-2017, 06:59 PM
Jimmyspy Jimmyspy is offline
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Default

As others have said, the forward shift is from your lift shackles. I have the same issue with my belltech shackles and expo leafs.


I also agree that your pinion angle looks a bit off. Maybe it's just the angle of the photo? Are your springs sitting right on the axel tube?
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  #6  
Old 09-12-2017, 07:30 PM
ILivermore43 ILivermore43 is offline
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Default Re: What is causing this? How should I fix it?

Quote:
Originally Posted by Jimmyspy View Post
As others have said, the forward shift is from your lift shackles. I have the same issue with my belltech shackles and expo leafs.


I also agree that your pinion angle looks a bit off. Maybe it's just the angle of the photo? Are your springs sitting right on the axel tube?
Yes

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----------

Quote:
Originally Posted by johnday View Post
It's your shackles, a few guys are mentioning this lately. Mean olde Mr. Physics can be bad at times.
Look at your pinion angle, see how it's tilted nose up further than usuall? That's from the shackles too.
I like those Ions.

Did that spring pack come with tapered shims? Which way did you install them.
If you'd like, I'll take a photo of my pinion/differential angle tomorrow. I have a 2" lift with an AAL, stock shackles.
Regardless of which way you installed the shim, you'll still have the same problem with the axle moving forward. By using those shackles, the whole differential and spring packs are hinging on the frone spring perches, thereby hinging your axle forward.
With so many guys on here that do the shackle thing, you'd think even more on this would come up.
What's the right way? Throw those shackles away, and lift with either a tapered block, or better yet, an AAL.
Which way is the right way for the shims?

Sent from my SM-G955U using Tapatalk

----------

Quote:
Originally Posted by CalebJ View Post
Fix the pinion angle, but don't spend too much time dreading the slightly forward axle position. The reason so few people are discussing the issue after all the shackle installs is that it just isn't a big deal. It's a minor cosmetic issue, not a functional problem.
I'm just kind of ocd about little things like that

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  #7  
Old 09-12-2017, 08:03 PM
johnday johnday is offline
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Default Re: What is causing this? How should I fix it?

Tapered shims and blocks when used for a lift application, the short side, or the thinner edge of the taper is installed facing the front of the vehicle. In your case, I wonder if the taper might be too much? Also, how much lift did you get out of the shackles? The more lift, the more the pinion angle will be pointed up.
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  #8  
Old 09-12-2017, 09:49 PM
crowdpleazer crowdpleazer is offline
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Default Re: What is causing this? How should I fix it?

How to fix properly? get rid of that useless unsafe lift and run it at the stock ride height.

You will be tearing up u-joints quickly with that setup.
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  #9  
Old 09-13-2017, 03:13 AM
JAMMANICA JAMMANICA is offline
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Default Re: What is causing this? How should I fix it?

Quote:
Originally Posted by ILivermore43 View Post
I'm just kind of ocd about little things like that

There is nothing wrong with this, I was holding my breath after CalebJ's reply, I had a similar reply in a very similar thread and the OP went off on me ripping my opinion publicly.

But I'm a little OCD about pinion angles LOL as they can cause damage. You "gotta fix that thang" lOL.
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00 XLT 4WD XCSB 4.0 my new baby
00 XLT 2WD RCSB 5.0 swap in progress.
98 XLT 4WD XCSB 4.0 dead
99 EXPO donor motor for dead one and parts for the others.
97 Mountaineer stripped donor for 5.0 project and other things
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  #10  
Old 09-13-2017, 09:29 AM
johnday johnday is offline
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Default Re: What is causing this? How should I fix it?

Here's some photos of my diff, and the angle of the pinion. I have a short AAL, for 2" of lift, stock block, and stock shackles.
Attached Images
File Type: jpg P1020443.jpg (40.9 KB, 23 views)
File Type: jpg P1020444.jpg (41.1 KB, 23 views)
File Type: jpg P1020445.jpg (40.2 KB, 22 views)
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'04 Edge, Scab/flareside, 2wd, 3.0, 5 speed, 4:10 open. Billet grille, Raceline Raptor black wheels, 265/75/16 DuraTracs. Tbar crank, AAL. Fox shocks, Thrush welded SI/DO swept back side exit. Morimoto projectors, '06 tails and power mirrors. LEDs all the way around. Blacked out fender badge. Access Limited rollup tonneau. 5% tint on back three windows. Airbox mod, FWIW. And a Border Collie that likes it too!!
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