2005 FX4 - Was under the truck changing oil and found a leak on the front differential. From the looks of it I'm guessing this is a pinion seal gone bad? I wasn't able to find much info on a front seal leak, but I'm assuming it is similar to a rear diff seal. Looking to tackle this myself, I have read up on the rear end fixes, is there a crush sleeve in the front to be concerned with? Any help is appreciated.