On the front diff where the drive shaft goes into the drive there is an oil seal. It has a metal sleeve that hold the drive shaft. Can you replace the seal without removing that sleeve? If not, can you remove the sleeve while on the machine without issue and then replace the seal and put it back in. The reason I'm asking is there is a nut, washer and a oil seal that must be removed in order for the sleeve to be removed. The manual says to use a special tool and a vice to hold things so you can take the nut, etc off. Any help would be appreciated.