I've just swapped my standard g-series diff with an LSD so i've got the old one sitting in my garage. I think that the standard Cressida diff is 3.7 am i right?
Anyhow... i have no use for a set of higher ratio gears so i'm not interested in a swap. Also, i may be rebuilding the LSD soon so i may need to use the old diff for while that's happening.
If you don't need it urgently, you're willing to pay for the gears and can instruct me how to safely remove them from the housing (i've never looked inside a diff) then i'd be happy to help you out.
Obviously if you can find someone in Sydney with what you need then that will be better but if all other avenues have been exhausted then let me know.