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oil pressure & transmission on 1990 Ford Bronco

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
i have a new oil pump&oil sending unit i drive for about 15 min oil pressure drops between 5 to 10 psi what else need to be replaced? may transmisson runs fine fwd /rev but backing up one time transmission fluid came back up out the dip stick.
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As the oil heats up it gets thinner and pressure will be lower as the oil gets hot and about the transmission are you sure it wasn't overfull?
no it wasnt even full it was a half quart low i checked 2 day before it happen.