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Is there any way to tell which style your car would have come with originally?
Not for 100% sure. It would require a survey of original cars built at the same time same plant. Unfortunately the information is not easy to see (unlike - for example PB boosters) and collect - you need to look at the id label attached to the back side
Maybe I'm missing something...but couldn't one tell by the color of the pump itself without looking at the ID label?
Yeah but chances of the pump being original to the car are pretty slim
I was reading the PS pump ID page on the 428CJ site. I'll have to ask over there about the distribution of Ford vs. Thompson pumps for the '70 CJ cars.
no transition period. ford built pumps are teal blue and the thompson pump is black. the tag on the rear indicated who built it.