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Old 05-06-2008, 05:24 PM   #1
67mater
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Need pic of shackle angle

I am re building a 67 4x4 with late model HD springs (relocating mounts/shckle flip, etc.). Can someone posts pictures or suggestions for the shackle angle when the eight is off the tires? front and rear. Is it Forward or back of vertical?

THANKS!!!!
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Old 05-06-2008, 08:48 PM   #2
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Re: Need pic of shackle angle

Shackle should be back. I like to see them about ten degrees with all the weight on the rig.

You can see what I did on my frame, where I positioned my shackle hanger, etc, pics are in my sig.
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Old 05-06-2008, 08:52 PM   #3
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Re: Need pic of shackle angle

my issue is that I have no weight on right now. I am trying to judge were the shackle to should lie with the tires off the ground.
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Old 05-06-2008, 08:54 PM   #4
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Re: Need pic of shackle angle

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Originally Posted by 67mater View Post
my issue is that I have no weight on right now. I am trying to judge were the shackle to should lie with the tires off the ground.
That's really tough to do. Spring rates, weight and all of that will change the shackle angle. I prefer to do them with all the weight on, as it's far more accurate. Caster and pinion angle will also change...

Even if you have to pile on cinder blocks (done it) to guesstimate.

Last edited by FormerMember; 05-06-2008 at 08:55 PM.
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Old 05-06-2008, 08:57 PM   #5
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Re: Need pic of shackle angle

looks like when you had bare frame in the air you lines the shackle mount to be straight above, correct?. How does that work out once the wieght is on? will that give the 10-20 degrees back angle?
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Old 05-06-2008, 09:01 PM   #6
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Re: Need pic of shackle angle

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Originally Posted by 67mater View Post
looks like when you had bare frame in the air you lines the shackle mount to be straight above, correct?. How does that work out once the wieght is on? will that give the 10-20 degrees back angle?
It did for me, but I have allot more weight and spring.
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Old 05-06-2008, 09:32 PM   #7
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Re: Need pic of shackle angle

67, depends a lot on your leafs. If they have a lot of arch in them they will flatten more when you put weight on them. A flat spring moves less. Also the number of leaves has an effect on how much it flattens out. As grendel said 10 degrees is a good rule of thumb. But you gotta design the spring system as a whole to get the best ride. And after all the location of the shackle is mostly about getting the best ride.
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Old 05-10-2008, 02:46 AM   #8
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Re: Need pic of shackle angle

These leafs are K-10 with a add-a-leaf added, so it arched them about 1.5" more with no weight right now... (eye to eye is shorter now) It's a 68 SWB K-10

The front is stock HD springs (3 each) with no weight...
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