The only way to lower the back of a 2wd is to do an axle flip really. Problem with that is you get too much drop and welding is required. So then you get into all sorts of things. The 4x4 Rangers got a lift block in the rear and I think the 2wd Edge and Trailhead editions got the lift block in the back too. If there’s a lift block between the axle and the spring, then removing that will get you lower. If there’s no lift block, then an axle flip is your next step but if you don’t want to be into frame notch territory you’ll need heavier leaf springs and a longer shackle. I did that to my green Ranger (it was a 4x4, now it’s AWD) and the back is still a little too low. Heavier leaf packs and no shackle ride height ended up being on the bump stops. That’s frame notch territory. Longer shackle (technically sold as a lowering shackle for some Chevy and Ford full size trucks, actually lifts our trucks) and even heavier pack and it’s still a tad low because it can hit the bump stops sometimes. There is really no kit because flipping the axle (or even using an Explorer 8.8 like I did that has the spring perches on the other side of the axle) requires cutting the perches off and re-welding.