7-1/4 Bearing Noise........

OK.........Leave it to Chrysler...........How am I supposed to get my gear lube IN the 7-1/4? I looked for any type of standard plug, and only found a giant steel plug of some sore on the back cover.......Looks like it takes a special socket or giant star tip..........WHAT THE HECK IS IT ? :clock:
I can't remember what I used. Allen wrench maybe. I'll find out come morning.