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Valve piston repositioning apparatus and method

  • US 8,234,784 B2
  • Filed: 02/13/2008
  • Issued: 08/07/2012
  • Est. Priority Date: 02/13/2008
  • Status: Active Grant
First Claim
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1. A method for extending the life of an automatic transmission booster valve, the method comprising:

  • partially disassembling the automatic transmission;

    disassembling a booster valve assembly including an original booster valve piston and an original booster valve sleeve from the automatic transmission;

    removing an original booster valve spring of the booster valve assembly;

    replacing the original booster valve spring with a replacement booster valve spring configured to shift an operating range of a booster valve piston from a worn portion of a booster valve passage to an unworn portion of the booster valve passage;

    removing ⅛

    inches of material from a spooled end portion of the booster valve piston;

    reassembling the booster valve assembly using the original booster valve piston and the original booster valve sleeve into the automatic transmission; and

    reassembling the automatic transmission.

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