https://www.jeepgladiatorforum.com/forum/threads/3rd-shock-over-rear-axle.24997/There is another thread on this somewhere. It's a solution looking for a problem. Jeep used it for a short time. So did Ram.
They were installed on 2020 models with a manual transmission to limit rear axle hop. I don't know if they were installed after that. I ordered the pieces from @AllMoparParts.com and installed it on my 2020 Overland.What Gladiators are getting those, and why? My SRT10 Ram has one from the factory but with that torque and leaf springs it makes sense.
It really shouldn't be necessary on a 4/5 link unless I'm missing something. Or it's a band-aid.