ok i can see you want to save money on blowing up diffs. I am in the same place I cant afford to be doing that either. However, the noises you are talking about are probably worn gears or bearings!! Do you have a noisey diff now? The Housing wont make any noise as it is just holding the axle set (axles diff centre and oil) so even if you use good oil it wont make any difference if the diff is noisey there is already a problem that no oil will fix!
I will once again say save you $15 up and every tim you could have spent more on something else then put it in a jar and before you know it you will have the money for your new T series! monay saved better diff in the car and you will be smiling