80 series diff oils

thanks bob l was getting different answers to which l should have in them manual says lsd 90 rear but does not say front shell says 90 front and rear so l put 80/90 front gearbox looked like it had auto oil in it emptyed nearly 7lts

thanks russ

Gday Russ
You will find your gearbox will become hard to shift...all cruiser boxes hate 90 grade especially in the cold climates...best oil for it is Castrol vmx-m 75-90, transfer and front diff, any 90 grade ep oil, rear ls90. There is no problem running ls90 in the front either, just more expense.
When you put ARB lockers in a diff, LS90 is recommended to assist the orings wear. For those who dont know, ls90 has friction modifiers added to the oil, which will interfere with synchros etc.
Andrew