THE MANUAL VALVE SUPPLIES OIL TO THE CLUTCHES. WHEN YOUR IN YOUR CAR OR TRUCK AND YOU MANUAL SHIFT PARK TO REVERSE, NEUTRAL, DRIVE, DRIVE 1, DRIVE2, DRIVE3 AND DRIVE 4 AND BACK, YOU'RE ROTATING THE DETENT PLATE, AND THE MANUAL VALVE MOVES LINEARLY. THE BIG QUESTION, WHAT ARE  ANGLES OF THE DETENT PLATE, WHERE DID THEY COME FROM ?. ANGLES HAD TO COME FROM "PITCH" OF THE MANAUL VALVE. GOING BACK YEARS AGO, MANUAL VALVES WHERE DESIGNED WITH GRAPHIC PAPER, 6 SQUARES TO AN INCH. YOUR DETENT PLATE ANGLES YESTERDAY AND TODAY STILL REMAIN THE SAME. HOWEVER WHEN DESIGNING A MANUAL VALVE YOU HAVE P.N.R.N.D.L.; REVERSE OIL IS SEPARATED BY 2 NEUTRALS.

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