Rear springs to match 5660s

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myAisaG

n00b
Aug 5, 2021
1
0
1
Maryland
Hi all I have been watching for a while now I finally need to post. I have been reading moog spring rate charts but not getting the information I need. Its probably went over my head im sure. Can anone recommend rear stock hight replacement spring to go with moog 5660 front springs I have 2 inch drop spindles to go with if there are any other suggestions. Just want the best match to what i have. It is a 79 el camino.
Thanks
 

81cutlass

Comic Book Super Hero
Feb 16, 2009
4,639
13,542
113
Western MN
5401's if you want to go low or have a light rear end
5409's if you want to haul a little and are OK with it being a bit higher.

This is 5660's with 1/2 longer front ball joints and 5401's on the rear, both uncut. Normal gas shocks (KYB gas adjust) with probably 100lbs of separation force. I swapped to a viking double adjustable and actually lowered the car on the back more than I wanted and when I toss 300lbs of crap in the trunk for drag week style events it sagged. I went to 5409's and it went up about an inch but settles in nicer with the tall drag radial and loads in the trunk.
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403Olds

G-Body Guru
May 31, 2014
531
418
63
South Central Ohio
I've got the 5413's on mine, I've not seen many running the 5401's, seems like a softer spring, that might help smooth out the ride.
 
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