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cutting coil spring

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wanting to cut 1/4 to 1/3 of coil off spring, noticed that the last 1 1/2 of spring is straight. there is a tab on the spring perch, where the end of the coil stops against it. question is cutting end of coil off, removes that straight section off the coil. will it still sit on spring perch correctly. tried to upload pic, it would not 

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Kind of.

The 'tangent tail' of the OE spring is there so that the spring won't walk out of the lower seat as it's cycled. Is the cut spring going to move? Probably not. This is one of the reasons why most will recommend against cutting springs, if that sucker comes out of there it won't be fun...

If you are diligent when re-installing the springs I think you can get the newly cut end to touch the stop. I've cut the springs on a car many moons ago but can't remember if I just left the end out in space hoping it wouldn't walk or tried to get the end to the stop.

Sorry for the rambling, not really answer...


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i know a lot people cut there springs and put it back together and dont give it a second thought. but i am not one of them. for now i put it back together, do some research on a new set of coils

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Check with Eaton Detroit Springs. They have or can make what you want. Cutting a spring alters the spring rate. Buy 1" lowering springs at the correct spring rate you need for your car. You can call or email them and I'm sure they'll be happy to help. Also if you buy Eaton's, you know you have good US made product not some offshore junk. 


 I learn something new every day!

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  • 2 weeks later...

I have cut springs for our cars many times without issue over MANY miles of driving. The tab on the spring seat can be adjusted to meet the end of the spring as it's fairly thin and seems to act more as an index point rather than a stop. I typically measure the distance between coils with the car on the ground from the top of one coil to the top of the next. This will tell you how much cutting one coil or a portion of a coil will shorten the compressed height of the spring. This is not how much it will lower the car. Then I measure from the inner pivot of the control arm to the spring perch and from the spring perch to the center of the ball joint. this will tell you what the ratio is. For illustration let's say they are equal or 50%. At 50% a 1" drop on the height of the spring will yield a 2" drop of the ride height. This is very predictable and ride quality stays the same. The spring rate will rise slightly when cutting a spring. If the spring has 10 coils and you cut one off, the spring rate will increase by 10%.

Take it or leave it, cutting springs has been a topic of debate for as long as I can remember. This is just my experience.

[align=left]Jeff T.


When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passengers. [/align]

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I’ve cut one whole loop off those one inch lowering springs from Mustangs Unlimited and I’ve been using the car as a daily driver during the summer months for about 8 years with that setup without any issues. You need to be careful to get the edge right when cutting them and of course you need to install them properly against the tab on the bracket. 

"If I were you...... I´d rather be me." 😛
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