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This is what I can find online. 9 inch Ford axles date from around 1957. Ford used two types of locking traction systems, the early system being called Equa-Locks and the later units were referred to as Traction Locks. I couldn’t find any specific first date for the use of the Equa-Locks, but there are examples in 64. They were used maybe as late as 69. Some later 67 vehicles seem to have used the Traction Locks. Traction Locks were used after this time period.
Ok, Edsels started using the Equa-Lock in 1958, Ford Passenger Cars in 1959 & Mercurys in 1958.