XF Gal, I'm presuming your wagon has a single rail, not a later 5 speed??
If so, there is the possibility of oil leaking from a small seal fitted in behind where the aluminium extension housing bolts to the back of the box..
Also, if the aluminium shifter housing is worn, the afore-mentioned grease does tend to leak out through a similar seal. These leaks normally find their way along the shifter rail and then drip down onto the gearbox.........
Help is at hand and it's not too expensive!!!
You should still be able to buy a gearbox service kit from Ford Spares, and the part number begins with 'XB' from memory..
I still have the bag here from my kit somewhere, I'll find the number for you if you have trouble.
You don't really have to remove the gearbox to replace these bits, especially if you have a hoist, but you will have to drain the oil for when you pull the extension housing off..
If it's only the shifter housing that's bleeding, then it's not even necessary to drop the oil!!! You should be able to get the shifter housing out with a little bit of fiddling around.. Drop the rear crossmember and support it all on a stand.
Be careful not to go too far incase you damage the engine mounts, or touch the radiator with the fan..
The other normal leaks on these rockets are the speedo sender, and the rear seal at the back of the extension housing where the tailshaft fits in.
If the front main gearbox seal (or the rear main engine seal) is dying, your clutch won't be far behind it....
I had to do the same job on my old XD as it had the same problems, I'm sure the kit was only about $20..
Just make sure you get the two seals I was talking about with it, otherwise you won't be a happy gal!!!
If you need any more info, please ask!!!
Original XD 351 Ute - I got one!!
HSV - I just don't want one....EVER!
My XF 3 on the tree ute is ALWAYS stuck in third......