This is a tough one. Pressure is 50-90 psi, fluid out front line in at back line to rear bearing. Troubleshooting chart says possible sticking accumulator (in case above/behind valve body) not easily checked. Some trucks had check valve in trans line at radiator so not the case if older car. If nothingelse was changed all I can think of is improper filter gasket alignment restricting pump intake and reducing discharge pressure. Just tossing out some ideas.
