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Old 01-31-2007, 05:37 AM
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4 link rear using leaf springs

Ok, I;m sure some of you will call me crazy, but I'd like to attept to install a four ling bar system using my original leaf springs. I think i'd have to install a front sway type shackle in addtion to the rear one to allow the springs the freedom they need to flex, but what other things do I need to look out for? Has anyine else attempted this?

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Old 01-31-2007, 06:52 AM
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I think a fellow woudl need to use what we call a bird cage in order to allow that to work..Bird cages allow the housing to rotate so the 4 bar does it job the way it is supposed to..

Sam
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Old 01-31-2007, 09:29 AM
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Actually, the Mopar drag racers in the late 60s and early 70s used to do this. You need some sort of "slipper" mechanism between the housing and the spring. It isn't just rotation, the housing also needs to have the ability to slide forward and backward slightly relative to the spring also. You do not want to use shackles at both ends of the spring. If you do, the springs are not positively located front-to-back and can move in ways you don't intend. That will change the effective spring rate and defeat the purpose of what you're trying to do.

My feeble memory seems to recall that the Mopar Missile of the early 70s used an arrangement like this.
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Old 01-31-2007, 10:31 AM
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Quote:
Originally Posted by joe_padavano
Actually, the Mopar drag racers in the late 60s and early 70s used to do this. You need some sort of "slipper" mechanism between the housing and the spring. It isn't just rotation, the housing also needs to have the ability to slide forward and backward slightly relative to the spring also. You do not want to use shackles at both ends of the spring. If you do, the springs are not positively located front-to-back and can move in ways you don't intend. That will change the effective spring rate and defeat the purpose of what you're trying to do.

My feeble memory seems to recall that the Mopar Missile of the early 70s used an arrangement like this.
That was called "link leaf" and it was Don Carlton, dude was one sharp cookie! I think he got killed in a testing accident, with the "Motown Missle".
That system used the spring as one bar of the 4 link bars and a bar that was 20 inches long for the top bar.
There is a complete article on how to do it in the Mopar Direct Connection Performance Book (Chrysler Bible).

Last edited by dgcantrellsr; 01-31-2007 at 10:44 AM. Reason: adding info
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Old 01-31-2007, 11:00 AM
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Quote:
Originally Posted by dgcantrellsr
That was called "link leaf" and it was Don Carlton, dude was one sharp cookie! I think he got killed in a testing accident, with the "Motown Missle".

Actually, it was a Dodge Colt that killed him, not an E body. Summer 1977.
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Old 01-31-2007, 12:54 PM
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The best way would be to use a four bar axle housing and just use the top two bars, similar to what dgcantrellsr described. The leaf springs would support the car and act as the lower links, the top two would prevent the axle from twisting. If angle out the top bars would also control side to side movement.
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Old 02-01-2007, 01:15 AM
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I think it would help if we knew what type of vehicle you want to run this in. Thanks.
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Old 02-01-2007, 04:22 AM
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1935 Chevy Standard Model 4 door Hot Rod. PLan to run a GM rear axel and the original frame.
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Old 02-01-2007, 06:43 AM
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This idea (using the leaf as part of a multi-bar linkage) has been discussed in another thread here. When the rules might require such a trick (as with the Missile), it could be justified, but keep in mind that, since the leaf is still rigidly attached to the axle housing, spring wrap-up hasn't been totally eliminated. (Whoops! Joe_padavano's post indicates that they might have tried to eliminate that rigid connection.) Still, I would say it's better to simply toss the leaf springs and go to a 4link or, for the street, a 4bar. (For optimum adjustment, go to http://home.earthlink.net/~whshope/id8.html ).

Just realized, there's also an active thread here where Magnante's 500 cube Chevette is being discussed. In that case, the front half of the leaf spring was used as what could be considered a ladder bar.
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Old 02-01-2007, 01:06 PM
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Quote:
Originally Posted by dgcantrellsr
That was called "link leaf" and it was Don Carlton, dude was one sharp cookie! I think he got killed in a testing accident, with the "Motown Missle".
That system used the spring as one bar of the 4 link bars and a bar that was 20 inches long for the top bar.
There is a complete article on how to do it in the Mopar Direct Connection Performance Book (Chrysler Bible).
That is what Shelby did in 65 with the GT350. The 66 set up was actually better because the leaf spring was in tension not compression. It is ancient technology and not the best for planting the tires.

Here's the story on the Chevette. It is a version of the new kit Fatmans is selling for the Mustangs. Ancient technology from the 60s.
http://www.dieselchevettes.com/PDF/thebadseed.pdf
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Old 02-01-2007, 01:38 PM
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In the early 70s, NHRA required the stock springs in super stock. On my 68 Camaro I used a housing floater that let the axle housing rotate and move front to rear. I built my own floater and 4-link. The kit is still available from Competition Engineering.
Bob
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Old 02-03-2007, 02:05 PM
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Thank you all for your input. Sound like it would be simpler (and maybe cheaper) to switch it all out to coils and four link. Thanks again
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Old 02-05-2007, 06:26 AM
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Quote:
Originally Posted by fosterdl
Thank you all for your input. Sound like it would be simpler (and maybe cheaper) to switch it all out to coils and four link. Thanks again
That would be my choice. That spring slider will wear out very fast on the street.
Bob
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