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Old 04-22-2003, 09:25 AM
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Post rear coil over spring rates

Putting coilovers on my 39 Chev Pick up. What rate should I use? How do I determine what rate when I only have a bare frame? Truck will not do any hauling and I will be running a small block motor.

[ April 22, 2003: Message edited by: stea ]</p>

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Old 04-23-2003, 03:07 AM
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I'n not sure what you mean by spring rate. I am familiar with spring load and that is what weight it takes to depress the spring 1 inch. ie, if you have a 500 # spring, then a 1000 # load will depress the spring 2". Since you have two springs on the rear, then 1000# would only depress the springs 1". Now you can calculate what spring load you need. Assuming your PU weighs about 3000#s total and only 1/3 of the total weight is on the rear axle, 500# springs would have 1 " depression. But you want the ride height to be say another 1" lower so you would go to 250# springs. Now control the spring rate with Shocks.

Trees
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Old 04-23-2003, 07:08 AM
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THANKS TREES
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Old 04-27-2003, 12:43 PM
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Stea.
I'm at the same point as you are --- i.e contemplating the correct Spring Rate. Went to a trade show yesterday, where the guys selling AFCO Coilovers thought that 300# springs would probably be O.K. for my ride which is rated at 3854 lbs. I'm thinking that might be a bit stiff, so will begin with 250's (can swap them for 300's, if it feels too soft)
Did you commit to/install a set already? <img src="confused.gif" border="0">
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Old 04-27-2003, 02:21 PM
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Cool

You could also call Speedway Motors and ask a tech guy. Thats what I did. He'll ask you some questions about your car.Fenders or not etc.Thats what I did & they were right on....Lash
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Old 04-27-2003, 05:50 PM
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ARPEE, havent bought yet, working on the panhard bar setup right now but from what ive heard i will probably go with the #250 springs. I wont be hauling anything so I think they should be about right.

Let me know what u think when u get yours.
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Old 04-27-2003, 06:16 PM
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I have a 55 Ford F-100 with a 9" rear end and Aldan coilovers. The bed is aluminum and tubbed so it's slightly lighter than stock. The guys at Speedway recommended 250 pound springs and they work perfectly.
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Old 03-06-2004, 12:18 PM
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Well, in my opinion, 300# springs are too much for anything under 4500#'s. I have a 2000 Dakota R/T with 300# 10" springs and I just ordered some 250# so that my ride quality will get better. Currently, the 300#'rs will make the tires come off the ground on a decent bump. My truck's weigh distribution is 60/40, so that means I have about 1600#'s on my back end. I hope that puts it into perspective.
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Old 03-06-2004, 06:01 PM
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Ine thing that you need to consider is that the weight for figuring your springs is the sprung weight, not "to ground weight". If you weigh the rear of your vehicle at the tires, you have added the weight of the rear axle, tires and wheels to your calculation. Your ride quality will depend on the right springs for the weight, and also the correct shocks. Too stiff of a shock will not support more weight, but willmake it harder for the spring to compress for bumps.
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