9 1/4 and dana 44

Pull the cover off the 60 and see if you actually have a locking rear.
Spinning on dirt with both wheels then in a mud hole only spinning one sounds like you have an open rear.
Leave the front alone.
I have front and rear lockers in my Willy's and hate them, to much noise, jerky on the street.
I am about ready to take the locker out of the front and put a open carrier back in.
You cannot steer the thing in 4wd unless the hubs are un-locked even in mud.