Sagging coils has nothing to do with the tires hitting the fenders while articulating. That would improper set up of bump stops and would occure regaurdless of height of the coils.

 

Agreed. But I also think I understand what he's trying to say. I think the general point he was making is that when the lift was installed(and he probably didn't put in bump stops, especially as rc lifts don't have em. Mine didn't at least, so I learned the hard way) because the vehicle was sitting taller, when going over an obstacle, the articulation of the axle didn't cause the tire come into contact with the vehicle. Which geometrically makes sense. But now, as the vehicle is sitting lower, that same amount of flex is causing the wheel to come into contact with the vehicle. That's how I learned that I needed bump stops.

With my old 4 inch RC lift, I never experienced rubbing, jarring, etc. Everything was just smooth. Compared to stock at least, lol. And then as my vehicle eventually sagged about half the size of the lift(due to about an inch of sagging, and then the addition of a LOT of weight after that) I started to find myself bottoming out, rubbing, etc. After that, I replaced my coils, and all those problems stopped.

This time however, I also installed the JKS ACOS Pro bump stops, so I don't forsee that issue happening again, regardless of sag.

 

Dirtman is 100% spot on.

Springs are not designed to stop up-travel. Bumpstops are designed to stop up-travel.

Just because Rough Country sells incomplete kits, with substandard components and horrid designs, and preys on inexperienced jeepers, with a low price-point strategy, it doesn't change the physics.

If Rough Country decided that to avoid including extended bumpstops at a nominal extra cost in order to continue to prey on inexperienced jeepers with their low price-point strategy, I suppose they could include ubber-stiff springs that do not give even 1/2" with the addition of 160 lbs.

They include a drop pitman arm and front trackbar relocation bracket instead of adding a nominal cost to include an adjustable front trackbar on their 4" kits. So, I wouldn't put it past RC to run stiffer springs so that they wouldn't have to include $50 extended bumpstops.

 

Yes, this was my point exactly. Obstacles that I have hit in the past and / or obstacles that are similar that I have cleared in the past without rubbing, are now rubbing. I understand how bump stops work and I do realize that with out proper bump stops I risk rubbing. I also know (again) that this is a cheap kit (like I said, I literally paid two full tanks of gas $ for this full kit, knowing it was a cheap, quick solution, and fully expecting to one day throw it away. I just did not expect one day to be 8 months after install).

My question, which kind of got answered by some friendly experienced Jeepers on this site (Thank you), was pertaining to weather or not the spring steel could "wear out" at such a rate causing it to sag and allow for more than usual flex.

Again, I believe I got the answer I was looking for. Thanks.