75000k Diff and Transfer Case
 

What is the best Diff Case fluid to use for the 75000k mile service? will castrol 40w90 synthetic work?

No answers.... Really?

Use the rover stuff. Its special fluid for the Transfer case as it has clutch plates.

Only replace the rear diff if it has a electronic locking differential.
If it is use the stuff rover says.

it might sound expensive but remember its once every 75k so its gonna be alot cheaper then say a disco two which is every 30k.