Alright so this morning I was pulling out of the garage an there was a decent amount of liquid on the garage floor. It seems to me like differential fluid just because its right where the diff was sitting...

What can be causing this, is it a bad fix, etc.

Btw I have a 92 400 if it makes a difference.

 

I'm curious about this myself because my dif is leaking and I can't seem to find a gasket or a seal for my 300 either

 

More than likely the seal on the outer part is leaking. You will have to pull it out to change it. It is sealed by high temp silicone, no gasket. If it is on the sides leaking, then it is the actual seals where the axles slide in. Those can be replaced w/o taking the diff out. When you pull it or drain it, see if the drain plug has any metal shavings. If so, inspect a little further and see why. It is normal for a very mild small amount.

 

If you were facing the diff of my car, if my car was on a lift of course, you can see the back portion of the diff is wet, and leaving small drops of fluid behind. Its dry on the sides for sure.