daihatsu fourtrak EL TD rear diff oil leak


I have a 1990 fourtrak EL.
I have a problem with alot of oil being thrown out of the rear diff, i think it is the oil seal ,can anybody tell me how easy it is to change the seal. and if anyone has other ideas why there should be excessive oil being thrown around under the body around the rear diff area, would they be kind enough to assist.

Diff Leak

Check the cover plate it could be corroded. I have just changed the cover on mine, a 89 DL