Soft or hard leaf springs - 460 Ford Forum
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post #1 of 9 (permalink) Old 08-10-2006, 11:12 PM Thread Starter
 
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Soft or hard leaf springs

I'm in the process of fitting some slide-a-links in the back of my 70 aussie fairlane which is similar to the american cars of the same era.
I'm sure the slide-a-link works the same as the caltracs so some answers from caltracs users would be helpful.
Is it better to run a soft rear leaf spring or a hard leaf spring to get the system to work better?
I assume the softer option would be a better choice, but want to get opinions.
I know they recommend a monoleaf spring with caltracs, but that's not an option for me.
My rear springs have an extra leaf fitted, but I'm comtenplating removing it before I refit the springs back into the car.

Any help would be great as I'm getting to close in time to refitting it all

Thanks
Mick
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post #2 of 9 (permalink) Old 08-10-2006, 11:28 PM
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I think it comes down to trial and error, or testing, testing, testing!!
There are lots of factors involved, automatic or stick?? transbrake?? weight of vehicle?? desired goals??

I have a 68 Torino, same basic rear suspension setup as your car.
My car is HEAVY!! I have heavy duty leaf springs that consist of five leafs instead of the stock four leafs. They seem like "hard" springs to me.
I have Cal-Tracs bars on it, and it is an automatic without a transbrake...I just "foot it" 8).

As the world turns...I get more dizzy!
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post #3 of 9 (permalink) Old 08-10-2006, 11:35 PM Thread Starter
 
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Ok some car details may help ops:

1970 ZC fairlane
460 bb possibly 600 hp
c6 Full manual trans brake
3500 hi stall
3.9 gears possibly changing to 4.4 (approx)
Car weighs 4000 with driver (again approx)
90/10's and soft springs in front
car has been minitubbed and will use a 10 or 12 slick (26 or 28 tall depending on gears)
Hoping to get low 11's and then chase 10's
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post #4 of 9 (permalink) Old 08-11-2006, 05:37 PM Thread Starter
 
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Just a bump to the top, I need an answer before fitting them back in, in a few hours.

Thanks
Mick
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post #5 of 9 (permalink) Old 08-14-2006, 09:26 AM
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My 39 year old stock springs seem to work great with my Caltracks. I use Rancho adjustable shocks to control the rear end lift, not the springs.

1967 Falcon 4 door
Owner built, owner abused.
http://raceabilene.com/misc/hisnherspic.jpg
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post #6 of 9 (permalink) Old 08-15-2006, 05:58 AM Thread Starter
 
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Thanks for that, I have fitted it back with the added leaf spring arrangement. The local Caltrac distributor heare, says they recommend a 200 lb spring as a starting point and most standard springs are in the 160-180 lb ball park, so the extra leaf may be close to the 200 lb.
I'm now chasing a local supplier for some rancho's, are your set soft or hard?
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post #7 of 9 (permalink) Old 08-15-2006, 09:10 AM
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On 6.
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post #8 of 9 (permalink) Old 08-15-2006, 09:35 AM
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Do you have a part number for the Rancho shocks?
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post #9 of 9 (permalink) Old 08-16-2006, 05:51 AM Thread Starter
 
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To suit my aussie car the rs99201's appear to be closet to the standard shock
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