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In short, you'll have oil drain-back issues causing hard extended starts using a 99 pump on a 95. I can't recall when the later pumps went to a 17 degree design (flows more oil). The IPR will also be different as well as the front cover. See the attached. Cheers!
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I believe the higher capacity 17 degree pump was on the 99.5 models which went to slightly more injector capacity over the early 99's.

Also front covers are not easlly interchangeable between OBS and Superduty engines. A major difference is the location of the pickup tube changed sides. Passenger side on Superduty front covers.
 
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