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Spring Rate Advice #3025361
03/19/22 08:58 AM
03/19/22 08:58 AM
Joined: Nov 2003
Posts: 1,001
Canada
Ghoste Offline OP
super stock
Ghoste  Offline OP
super stock

Joined: Nov 2003
Posts: 1,001
Canada
I hope this is an easy question. The car in question is a 69 Charger RT, four speed car with 3.54 rear. Engine is mild 440 and I have no dyno numbers but just for the sake of my question let's call it 500 horse and 500 torque. Car is primarily street driven with a couple of dragstrip visits per year.
Current leaf springs are the factory oem, so they are 50+ years now. Someone gave me a pair of Caltracs but based on my use of the car, I'm leaning against installing them now. I think for my purposes, a fresh set of leaf springs with a good old fashioned pinion snubber will be fine. I plan to use Eaton Spring as a supplier. I've used them in the past and more than happy, but they offer 2 versions. An oem spring rate and an xhd.
Opinions? (and if it makes any difference to my spring rate question, I should mention I'm adding the USCartool chassis stiffening basic kit which of course means a subframe connector)

Last edited by Ghoste; 03/19/22 09:05 AM.

I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: Spring Rate Advice [Re: Ghoste] #3025586
03/19/22 10:29 PM
03/19/22 10:29 PM
Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
T
TC@HP2 Offline
master
TC@HP2  Offline
master
T

Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
FWIW, the XHD springs were factory on the six-pak and Hemi cars. Their rate is around 150#. I believe he other "standard" springs are actually different between 440/383 cars and /6 and 318 cars with the big block springs being slightly heavier. I'm sure others who know OEM specs better will correct me.
FWIW, the XHD springs sets came standard in cars that had heavier torsion and sway bars up front. If you have a small block front end, uses the standard leafs. If you have larger, heavier front components, use the XHD set.

Traction devices are usually a not a factor in spring rates, they control over-powering impacts such as a drag launch. But, they can allow softer then normal spring rates because of their control capability.

Re: Spring Rate Advice [Re: Ghoste] #3026463
03/22/22 04:54 PM
03/22/22 04:54 PM
Joined: Sep 2006
Posts: 1,161
Los Angeles, CA
JF_Moparts Offline
super stock
JF_Moparts  Offline
super stock

Joined: Sep 2006
Posts: 1,161
Los Angeles, CA
What is the front spring rate? Stock torsions or aftermarket?







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