Need pic of shackle angle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67mater · 05-06-2008, 05:24 PM

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!!!!

*FormerMember* · 05-06-2008, 08:48 PM

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.

67mater · 05-06-2008, 08:52 PM

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.

*FormerMember* · 05-06-2008, 08:54 PM

Quote:

Originally Posted by 67mater

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.

67mater · 05-06-2008, 08:57 PM

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?

*FormerMember* · 05-06-2008, 09:01 PM

Quote:

Originally Posted by 67mater

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.

cobinder · 05-06-2008, 09:32 PM

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.

msgross · 05-10-2008, 02:46 AM

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...

05-06-2008, 05:24 PM	#1
67mater Registered User Join Date: Sep 2007 Location: Mundelein, IL Posts: 862	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!!!! __________________ time is inversely proportional to money; that's why it takes me so long 1967 K10 1967 Camaro

05-06-2008, 08:48 PM	#2
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	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.

05-06-2008, 08:52 PM	#3
67mater Registered User Join Date: Sep 2007 Location: Mundelein, IL Posts: 862	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. __________________ time is inversely proportional to money; that's why it takes me so long 1967 K10 1967 Camaro

05-06-2008, 08:57 PM	#5
67mater Registered User Join Date: Sep 2007 Location: Mundelein, IL Posts: 862	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? __________________ time is inversely proportional to money; that's why it takes me so long 1967 K10 1967 Camaro

05-06-2008, 09:32 PM	#7
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	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. __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome

05-10-2008, 02:46 AM	#8
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	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... Attached Images __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 05-10-2008 at 02:50 AM.



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