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Q: oil pressure & transmission on 1990 Ford Bronco

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?
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