Purpose of Gray Sleeves on Coil Springs

[TopsOff]

What are these sleeves for? I see they are indexed with green marks. I have a set of Rubi takeoffs - and these are the rear springs. One spring has nothing - but has the green index - while the other has 2 sleeves - both indexed.

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[Rubi-Zero]

they are there to reduce noise if I remember correctly

 

[AnnDee4444]

I wonder if it has to do with coil spring bind. I could see how these would prevent most metal-to-metal contact.

Not sure if that's even an issue with the OEM springs, and why it would only be on one side.

 

[TopsOff]

Thanks for getting me started. I didn’t even know what to google. It’s a spring silencer and it’s not on the parts diagrams. I also noticed while looking at all the the JLUR takeoff suspensions for sale - there seem to be multiple variations. Some setups have nothing on either rear spring. Some have 2 on one spring, with nothing on one (like mine).

I’ve no idea if it’s supposed to silence coil bind or harmonics/ vibrations within the spring.

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