The first 225's were aftermarket. Warn built on its name with a swap-kit...they even offered an out-the-door conversion. The Jeep people were so intrigued they went to Warn's shops to see the installation; they were impressed and began engineering a factory option.
A few years later when Buick phased out the 225, Jeep liked the engine so much they bought the entire line...until AMC sold it back to GM in 1976 (discontinued use in 1971).
The history of this rig would be interesting. Was this a Warn conversion? What year was the engine?