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Welcome to the forum. Marlin.
Forgive the "lesson". Us Mopar guys don't usually embrace
Chevrolet terms like "Posi". If you mentioned that you had a
Rock Crusher 4 speed you'd really catch some flack!
All the automakers had marketing names for their products. Our automatics were called
Torqueflites. Gm called theirs
Turbo-Hydramatic. Ford called at least one transmission a
Cruis-o-matic.
Ever heard of a "Top Loader" 4 speed? Ford.
Traction Lok? Ford differential along with Detroit Locker.
Ma Mopar had their own names...."Sure Grip" was what they called their limited slip differentials. I know, it doesn't roll off of the tongue like
Posi does but it is the correct term.