Just got back from having the truck inspected (2001 Limited). The driver's side rear brakes were thoroughly greased up, apparently from a leaking axle seal. Did a search here and didn't come up with any info on what's involved in replacing the rear axle seals. What's involved and are there any special tools involved? I've got a pretty decent range of tools, but the tech that inspected my truck said he thought it took some special tools and that he didn't want to mess with it. Help?