Well I took it apart as there was next to no oil in it.
I got some grease from my dads grease gun, no idea what kind it was, but it was kinda red/pink color. Clean the runny oil off the parts I wanted to grease,
the drive cub shafts, the pins and the underside of the drive gears?
Tried my best to get a decent amount all around the gasket all sides, and then poked the extra grease that was in the screw holes, out to the countersink part and spread that around. I did a quick drill test and seem to of held. put in back in the car and drove it for about 2 mins because it was soo cold... for some reason it was much stabler, less steering changing...
Then when inside I lifted 3 wheels of the ground and tested the diff again, guess its good for now, if it does it again, I think I will just put a bunch of the grease in it and call it good.
This time it also looked like it sealed better, by a few nanometers, all around the belt gear. It could have been that I put too much oil in and when torquing down I was feeling the oil/air compress instead of torquing down to seal.