Thanks for the advise Rebel.
I picked it all up today.
Boy those Jags are heavy beasts, I had to help the guy at the wreckers push one out the way to get to the parts I was after. I should have asked for a discount.
I've got both front and back from a XJ6 Series 3, diff ratio is 3.085
Had to get the whole front bits including cross member and steering rack etc.
All looks ok, but still have to clean it up a bit.
This might sound like a dumb question, but here goes...
What is the proper way of cleaning parts like these? Are there any chemicals/methods that should not be used, or is it just a matter of whatever gets the thing clean is the go?