I'd like to change the transmission pan seal and filter on my 2006 LJR. It has a Rubicon Express long-arm kit with a large skid plate that's right up against the transmission pan. I assume something other than this skid plate is holding up the transmission and transfer case but I can't see anything that is obviously doing so. If I'm to prop up the drivetrain with a jack when I take this skid plate off, where should I place the support?