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How many leaves...
#1
After a look under my 71 Mach 1 i got little curious. The leaf springs in the rear have 5 leaves each. I read somewhere even 429 equipped mustangs only had 4-leaf springs. Is this a heavy duty factory option, an aftermarket solution or simply a wrong set of springs?

Michael
   
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#2
Spechti;15120 Wrote:After a look under my 71 Mach 1 i got little curious. The leaf springs in the rear have 5 leaves each. I read somewhere even 429 equipped mustangs only had 4-leaf springs. Is this a heavy duty factory option, an aftermarket solution or simply a wrong set of springs?

Michael
Not sure but i would say aftermarket..Or from a different ford car that is interchangeable..My 351CJ with the factory competion susp package had only 4 leafs..I just replaced them this week & I know they were the original leafs...at some point I'm going to do a 4 link setup but for now I replaced them with 4.5 leaf 1" drop mideye's

Scott

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
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#3
If your competition suspension has 4 leaves and also the 429 SCJ had 4 leaves, that seems to be the heaviest optional spring from the factory.

Does a 5-leaf give any benefit aside from a harsh ride? Does it minimize rearend wind-up? Any experiences here with a5-leaf?

Michael
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#4
Hey Michael, how are you??... What i can tel you is my car has the heavy duty suspension option and if my memory dont fail, it also has 4 leaves...
I don´t know how the life of this cars went by over their 40 years of life but here in Uruguay, there were some times that this cars was very very cheap cars so people used to use them as anything you can imagine... in fact, I own a V8 Mercedes Benz 350 SLC that before me, the past owner used the car with a diessel engine to transport bricks.. obviously modifying its suspension...

What i´m trying to say is maybe your car used to have 4 leaves and at some point, someone add one extra leave... I know it can be done somehow... Maybe you can check of evidence about one slightly different leave...

Hope it helps! gool luck!



Damián Cool

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#5
Spechti;15220 Wrote:If your competition suspension has 4 leaves and also the 429 SCJ had 4 leaves, that seems to be the heaviest optional spring from the factory.

Does a 5-leaf give any benefit aside from a harsh ride? Does it minimize rearend wind-up? Any experiences here with a5-leaf?

Michael
Leaf-Spring Selection Tips FOR AFTERMARKET SPRINGS NOT STOCK FORD SPRINGS
Eye style determines car height. Leaf count determines ride quality and performance level. Four-leaf springs provide a ride slightly firmer than stock GT leaf springs, and are the correct choice for mostly street driven vehicles. Four and one-half-leaf springs are recommended for moderate performance and spirited street driving. The extra half leaf provides additional stiffness between the forward eye and axle, better resisting spring wrap-up. Five-leaf springs provide the firmest ride and resistance to wrap up, and are primarily used for performance driving.

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
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#6
Hello Damián and Scott,
I am sure my Mach 1 has 40 years of questionable use behind it when I have a close look at things. I think it also has a history as a race car, because some of the rearend components were beefed up by one of the previous owners. This includes Koni adjustable shocks tuned to a hard rate, a Detroit Locker, 4.00:1 gears, removed traction bars and the mentioned 5-leaf springs. I suppose it was drag raced.

In the future the car only will be driven on asphalt roads on nice days with nice weather by a nice guy. No sporty ambitions. And I would appreciate a firm but comfortable ride.

When these springs are too hard for a nice ride, they will be changed for a more original set. If they are okay I'll keep them.
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#7
If they are too stiff you can remove a leaf to reduce the rate. I would recommend leaving well enough alone and soften the setting on the shocks, most of your ride quality comes from the shocks the springs just hold everything up. (well maybe that's an oversimplification Big Grin)

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

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