help with types of diffs

hi guys,
i've been trying to research this as much as possible, but info seems small.
i'm trying to clarify what all these different types of diffs i see referenced actually mean.
so from my understanding ford used two types of diffs called banjo and salisbury. for some reason the banjo was also called an english diff and the salisbury was called an atlas?
additionally who made these diffs? because it appears holden was using these diffs in the torana and kingswood in the 70s too.
appreciate the clarification
i've been trying to research this as much as possible, but info seems small.
i'm trying to clarify what all these different types of diffs i see referenced actually mean.
so from my understanding ford used two types of diffs called banjo and salisbury. for some reason the banjo was also called an english diff and the salisbury was called an atlas?
additionally who made these diffs? because it appears holden was using these diffs in the torana and kingswood in the 70s too.
appreciate the clarification
