Socket/bolt size for rear differential

[AZSCTACO]

Anyone know the size of the socket/bolt size for the rear differential for a 07+ Tahoe? I'm going to do a little fluid change so hopefully someone can save me some time.

Thanks!!!

 

[fiatdale]

I think theyre 13mm.

 

[scottg918514]

Cover is usually 14mm. Fill plug is 3/8 or 1/2 in square, use your socket wrench without a socket.