I came across some data indicating via a Willys Service Bulletin from Nov 1960 that the 27 was used and seems to indicate it was not common until it became standard in 1966.
"The Dana Model 25 was initially used as the front axle, however according to Willys service news of Nov. 1960, the Dana Model 27 axle entered production with serial # 57548 - 121248"
Other info I read says it wasn't used in mass production until 1966.
I seem to recall one of the members here is a retired Dana Spicer employee. Hoping they'll chime in and share their knowledge.
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