I see, is the seal just a little wet with a drop hanging on the underside of axle houseing or is it leaking to the point needing to add gear lube. If the lube is really running out, you my need more than just the seal replaced. I would ask around to find a good with the correct tools and know how to do it right. I have an 00 XLT and it has been wet for a long time. I have only added lub just resently before going on a 3,300 mile round trip. I have 159K & not planning on fixing it in the near future. My near future is pulling the engine for a complete timing replacement. Lubed for life only means, you never have to flush and replace when not requireing a repair.