Since everyone has a slightly different veiw I checked my 74 FSM, excact wording: 'All Chrysler cars equiped with manual steering use a recirculating ball type of sterring gear. This gear is permanently lubricated at the factorty and periodic lubrication is not required'. It does't even give a lubricant type.
Now I checked 'Fix your plymouth, by Bill Tobolt (1968), this is on rebuilding manual gear box. It says coat all parts with general purpose grease, then there is a set up section, then after instalation in the car it says to add SAE 90 multipurpose gear oil.
My Chilton manual for 65 to 74 Barracuda says the same thing word for word, except it has added this: 'There is no necessary service for 1974 models'.
I don't have any FSM's before 1974.