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Old 03-19-2015, 12:16 PM
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Coilover shock help

Looking for some advice here, I am working on a 1937 Chevy truck. I have a ford 9" and working on putting new coilovers in the rear. The truck all together weighs abou 2500lbs and the coilovers have a 200# spring in them. Mount on a 80 degree angle or 10 degrees off straight up and down.

The problem that I am having is when I put the weight of the truck back on the springs they barely move. It seems to have good spring when I push on the back end but it worries me on the ride height.


The shock says these specs
Adjustable Shock Centers - 14 1/2" Open and 10 1/4" Closed.

But when I measure the center to center of the bolts its just under 14".


Is there something I did wrong?

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Old 03-19-2015, 05:34 PM
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Sounds like too much spring to me, 130-150 lbs would be more appropriate for that light a weight vehicle, especially a truck as even less weight is on the rear than is on the front.
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Old 03-19-2015, 06:56 PM
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With the given dimensions I would expect the coil over to be at 12/121/4 inches at ride height with the correct spring in order to give both bounce and rebound travel. Will probably take a spring change to get there from here..100-130 lbs spring sounds about right..

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Old 03-19-2015, 10:46 PM
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Alright thank you. These are the shocks I got, hopefully they sell less weight ones or I will have to turn to Summit to find coils.

Quality Street Rod Rear Coil Over Shock Set w 200 Pound Springs Black Coated | eBay
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Old 03-20-2015, 10:24 AM
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You don't need "less weight" shocks, you simply need lighter springs to replace the heavy ones you have. Maybe a call to Summit will be of great help. They are always quick to assist, and will tell you if they can exchange the complete coilover, or simply swap lighter springs with yours.
I'd guess an old pickup that weighs 2500 lbs. has very little weight over the rear axle. Maybe 1,000 lbs. or so?
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Old 03-20-2015, 05:45 PM
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Yeah there can't be much weight in the back at all. I talked to the guy from Summit and he said around 115 or 120. Hopefully that will work
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Old 03-20-2015, 05:48 PM
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Any suggestion on what I should get?

This is the chart that Afco shows. The truck can't weigh more than 1200 in the back. Other than the gas tank there is nothing back there.
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Old 03-20-2015, 09:57 PM
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Once you figure for the 10°angle, the 130lb spring becomes 124...that sounds good to me.
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Old 03-21-2015, 08:42 AM
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Either the 110 lb. or 130 lb. I'd probably go the 110 unless there's fender clearance issues, where a softer spring might create a problem.
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Old 03-22-2015, 12:35 PM
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First thing to do is to drive to a scale and get the actual weight on the rear axle of your truck. Only then can you start choosing a spring. In the chart you post, car weight only moves in 100lbs increments, it is not much!
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