Yes, for the new SLA 4x4's it is a biatch. The fill plug is right above the frame rail and right below the body. You have to use a fluid evacuator to get the fluid out, but it has to be a tiny *** hose since it has to bend really sharp to get down to the fluid. Unless of course you drop the whole diff and pull the cover. To fill it back up with it in the truck it's easiest to use a fluid evacuator that is also a pump. Because there is no way to hold the bottle remotely close enough to fill directly from it.