Thanks Mark. We will use the 40 springs up front for sure. I am not sure what Atlas was thinking... Maybe it was my fault, but my brain tells me that while the springs they gave me are technically correct at stock arch, if you put a 4" lift arch in, that shortens the distance between pin and mount and thus they will not fit. My logical brain tells me that if someone wants 4 more inches of lift, then the springs need to be longer than stock spec to allow for proper distances and shackle angles when mounted. At $1800 shipped, that is what I was expecting... Atlas said they'd "make it right" a couple of months ago when we talked, so here's hoping...