Since most of the Clayton info is this thread i thought it'll be a good idea to leave this here as well for others to see.
If you're getting a clacking noise with your Clayton springs is because the dead coils might be hitting each other when the spring compresses, you hit a bump, or a pothole etc, etc. It's kind of a nature with long progressive coil springs. Some people may experience this some others may not, trucks are not created equal. but it's a super easy fix.
I've had that situation with Icon 1.5" springs and with the Claytons as well. My truck runs heavy in the back at all times (500lbs of weight in the bed, recovery gear, steel bumper, swing out rear gate carrier, Full spare, etc etc), and when travelling i tend to add more weight in there as well. Our travel may involve miles of washboard roads, sugarish sand washes or mountain dirt roads with rocks etc, so i need a suspension able to whistand that stuff and coils that can carry weight but also coils that feel nice when the truck bed is not loaded to the roof
2020-07-21_04-46-31 by
RAM RSM, on Flickr
Because of this the soft portion of the coils may hit each other if you get to experience the clack noise, you'll see the marks on the springs if that was the case. If you hear some noise and it happens to bother you all you need to do is add some sort of coil spring insulator.
You can buy for example Eibach spring insulators, eibach CS5002L, 1 per coil
2021-02-26_01-36-27 by
RAM RSM, on Flickr
Then cut 3 or 4 pieces and fit them in there as needed. the sleeves come with a glue inside so make sure to fit your pieces where you want them the first time, i tried to push that first SOB at the top towards the inside and it won't move. I can remove it and fit another piece but i'm not that anal haha.
2021-02-26_01-36-51 by
RAM RSM, on Flickr
Have fun.