Hey guys got a 94 f150 4x4. Recently did a full fluid change. Only one I was unsure about was rear diff. Especially since previous owner installed an Aussie locker. The Aussie locker directions state to just use what the manufacture recommends. What is the manufacture recommend for this year and if anyone else is running an Aussie what do you use? Not sure what's in there now. I looked through old receipts from previous owner and found some for 80-90w gear oil, not sure If this is what should be used or not. Any suggestions would be greatly appreciated.