Valve piston repositioning apparatus and method

A method for extending the life of an automatic transmission booster valve, the method comprising:

• partially disassembling the automatic transmission to access a pump stator body of the automatic transmission;
• removing a booster valve sleeve and a booster valve piston from the pump stator body;
• removing an original inner booster valve spring normally residing between the booster valve piston and a pressure regulator valve piston inside an outer spring;
• replacing the original inner booster valve spring with a replacement inner booster valve spring having a longer length L and higher spring rate than the original inner booster valve spring, the replacement inner booster valve spring configured to shift an operating range of the booster valve piston from a worn portion of a booster valve passage in the booster valve sleeve to an unworn portion of the booster valve passage;
• reassembling the booster valve assembly into the pump stator body;
• and
• reassembling the automatic transmission.

A method for repairing an automatic transmission booster valve, the method comprising:

• partially disassembling the automatic transmission to access a pump stator body of the automatic transmission;
• removing a booster valve sleeve and a booster valve piston from the pump stator body;
• removing an original inner booster valve spring normally residing between the booster valve piston and a pressure regulator valve piston inside an outer spring;
• replacing the original inner booster valve spring with a replacement inner booster valve spring having a longer length L and higher spring rate than the original inner booster valve spring, the replacement inner booster valve spring configured to shift an operating range of the booster valve piston approximately ⅛ inches;
• inserting a bumper shim inside the replacement inner booster valve spring;
• reassembling the booster valve assembly into the pump stator body;
• and
• reassembling the automatic transmission.