Installed a full kit on my 1970 C10 chase truck. The whole truck went up about two inches! They drive a bit rough now but I only got 3 miles with them. (I'm sure they'll break in like any other new shock. Yes, they were a little tricky to install, but not much harder than any other gas-filled shock that you have to compress to install. Just get a lever bar. Handy as I did for the fronts and pry them into the bottom bracket to get the bolt in. I'll update this again in a month or two (truck runs daily).