Rear springs

Old March 22nd, 2019, 05:07 AM
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Rear springs

Hello everyone,
I'm looking to replace my rear springs as the driver side is sagging about an inch (67 supreme 330 4bbl jetaway A/C) Moog has a few options. Someone here posted that they used the Moog 5413 which has a same height dimensions, but a 167 spring rate and of course was a harder ride.
It looks like the Moog 6321 is most like the factory spring (119 spring rate, 689 load rate). My other option is the 5379 (121.5 spring rate, 760 load rate). Do you think the 5379 would raise the car too much or give too harsh a ride? There's only 2.5 diff in spring rate but a big difference in load rate.
Any help or past experience with this would be helpful,
Thanks!

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Old March 22nd, 2019, 07:11 AM
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Looking at 1 of the pics you posted, I'd say your car is sitting close to stock now. What are you after?
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Old March 22nd, 2019, 12:02 PM
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Spring rate difference will not be noticeable, but the 5379 may raise approx 1/2" over the 6321.
The load rate is the anticipated weight on the spring installed in the car. Since the 4dr is heavier, it is wound to have the same height, while carrying more weight.
Remove 71lb load from the spring (760 vs. 689) & at a 121lb rate the car should rise ... 71/121 =.58"
Judging from the pictures of your car, I would expect the 6321 spring to lift the car up at least 1"-1.5".

Last edited by Lonnies Performance; March 22nd, 2019 at 12:05 PM.
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Old March 22nd, 2019, 12:30 PM
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Perfect, Thank you!
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Old March 22nd, 2019, 02:20 PM
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Hi

Are you trying to lift the rear of the car with new springs , adjust ride height?? Or just trying to level it out / get it up higher on the drivers side??
2 of my cars have 1 inch spacers between the rear coil spring and the axle on Left , drivers side , to remedy the "A-Body lean" Changing springs did not do that.

All the best
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Old March 22nd, 2019, 02:27 PM
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Trying to keep the stance...the drivers side is sagging a little...maybe spacers would be good. Even a half inch raising would be good
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Old March 22nd, 2019, 02:34 PM
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My 71 has a solid block of aluminum under the spring. The 72 has a steel spacer that bolts on to the axle.... I may even have another one of these??
I will try to find a link to somewhere that sells them. My slow as computer will not upload pictures
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Old March 22nd, 2019, 02:39 PM
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https://www.summitracing.com/parts/g...model/chevelle

Listed as being for a Chevelle but this should work
They also have shorter / taller ones

All the best
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