Detroit Locker for Dana 60 ?

I have a Dana 60 from a 3/4 ton 1971 IH pickup , Its stamped 60 on the housing , there is not a HD anywhere on it .
I will be having it narrowed very soon .
My question is ,is there any differences other then the 4.10 and down gears and the 4.56 and up gears that I need to watch for when I get a Detroit Locker.
Will Summits Detroit Locker # 225SL29B work ?
Heres a pic of my rear :)


Dana 60 pics 002 resized.jpg

Dana 60 pics 004 resized.jpg

Dana 60 pics 005 resized.jpg

Dana 60 pics 006 resized.jpg