Shackle angle
#2166229
10/02/16 12:42 AM
10/02/16 12:42 AM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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69 Super Bee. 3" MP inboard kit. Front segment is good. Original spring was 22", SS is 20. Original hanger hole to new hole is 2" further back.
My question is where to drill rear shackle hole. I've read about 56" and 57" leaf springs. Dodge and Plymouth differences. I'm now running P3690454, P3690455 which is hard to measure curled up with no weight on them.
I plan on a pretty low ride height, even if I have to dearch the springs.
How far away from the front hole should my rear shackle tube be for a good shackle angle?
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Shackle angle
[Re: Magnum]
#2166256
10/02/16 01:51 AM
10/02/16 01:51 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I like the bottom of the "vertical" hangars to be a bit rearward (from 6 0'clock vertical) loaded so the spring does not raise the car which it would as the shackle arcs & goes over center if the shackle was pointing forward but rather the spring "compresses" as it works WO raising the car. first I would locate the springs so the axle/wheels are where they look best in the wheelwells
live every 24 hour block of time like it's your last day on earth
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Re: Shackle angle
[Re: Magnum]
#2166366
10/02/16 11:56 AM
10/02/16 11:56 AM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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OP
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Posts: 5,791
Hamilton, Ontario Canada
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Ya Rapid, rearward angle for sure. So I centered my wheel in the wheelwell. Checked center of wheel to front leaf spring mounting hole. We have a good solid match at 20".
So basically how far back should the rear hole for the shackle mount be for the proper angle be? Im guessing a tiny bit shorter than a flattened out SS spring.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Shackle angle
[Re: Magnum]
#2166369
10/02/16 12:03 PM
10/02/16 12:03 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm thinking that you might have to go ahead with an edumacated guess for a start & drill some holes for a mockup to get it assembled/loaded then redrill more from there as needed unfortunately
live every 24 hour block of time like it's your last day on earth
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Re: Shackle angle
[Re: Cab_Burge]
#2166536
10/02/16 04:43 PM
10/02/16 04:43 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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I think you need to rethink the 3" dimension.
His front hanger is longer to account for the shorter front segment.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Shackle angle
[Re: Supercuda]
#2166633
10/02/16 08:04 PM
10/02/16 08:04 PM
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Joined: Aug 2003
Posts: 43,632 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,632
Bend,OR USA
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I think you need to rethink the 3" dimension.
His front hanger is longer to account for the shorter front segment. You may have a point if the O.P. is going to use the longer rear front hangar to move the front hole back two inches and not slide the rear end forward to improve traction by shortening the wheelbase. I normally trim the front edge of the wheel wells two to three inches to move the rear end forward at least one inch,sometimes two inches or slightly more ![whistling whistling](/ubbthreads/images/graemlins/custom/whistling.gif) I haved had several different Mopar leaf spring kits installed into the rear sub frames of, A, B and E bodys. None of those cars had enough rear shackle angle stock to make me want to keep the rear shackle hole in the same relation to stock when switching to the Mopar brand SS leaf springs with the two inch shorter front segments SS rear springs, hence my recommendation to move the rear hole forward three inches to gain one more inch forward on the upper mount to help increase the rear shackle angle more increasing the rear shackle so the rear of the car will work better under WOT ![scope scope](/ubbthreads/images/graemlins/custom/scope.gif) OP, make a mark on the rear sub frames with the same size hole as the current hole at one, two and three inches forward and look at those as a references to see what the rear shackle angle could be and pick the one you like the most ![scope scope](/ubbthreads/images/graemlins/custom/scope.gif) Make your decisions from there ![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif)
Last edited by Cab_Burge; 10/02/16 08:13 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Shackle angle
[Re: Magnum]
#2168718
10/05/16 11:30 PM
10/05/16 11:30 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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OP
master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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Since the Ss Springs are based on an A body size. If anyone has an A body. The front mounting hole to rear shackle hole should be all I would need.
Can we assume a Ss spring in an A body will have the perfect shackle angle?
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Shackle angle
[Re: Magnum]
#2168731
10/05/16 11:48 PM
10/05/16 11:48 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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57.26" center to center (front pivot hole to rear frame hole if I am reading my 71 FSM correctly.
Or measure original distance and subtract 2".
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Shackle angle
[Re: Magnum]
#2168767
10/06/16 01:10 AM
10/06/16 01:10 AM
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Joined: Aug 2003
Posts: 43,632 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,632
Bend,OR USA
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Can we assume a Ss spring in an A body will have the perfect shackle angle?
No, absolutely not! Install your springs first and then look at the rear shackle angles ![scope scope](/ubbthreads/images/graemlins/custom/scope.gif) Mopar made a bunch of different SS drag race springs as well as road handling SS type springs, not all of them will work well with stock front mounts and stock rear shackle hole locations ![shruggy shruggy](/ubbthreads/images/graemlins/custom/shruggy.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Shackle angle
[Re: Magnum]
#2169258
10/06/16 09:47 PM
10/06/16 09:47 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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What about installing a slider back there?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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