Dana 60 Pinion Nut

What size socket is needed to remove the pinion nut on a 1969 B body Dana 60?

Either 1-5/16(most likely) or 1-1/4"

i think it is 1 5/16" i know mine was not 1 1/4" because i had to borrow a socket to fit it and i already had a 1 1/4" to for the crank/ballancer bolt.