Hello. I have a 64 Galaxie with a 352 and c.o.m. The rear seal blew out last month so I replaced that but it still has a little leak. After looking at the yoke, Its pretty apparent I need a new one. Problem is can't find one. Someone told me a C6 yoke is the same. Is this true? If it is, does it matter the year? Thank you.

You have two choices:
1. install a "Speedi-Sleeve" to your yoke to repair the seal surface or
2. buy a new or reman yoke.
I do believe the yoke for the C6 is the same as some of the Cruis-o yokes.
Your local driveline fab shop may be able to supply new or reman yokes or install the Speedi-Sleeve.