Retrofit means for adjusting shift timing in an existing automatic transmission
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Aug 16, 1994
filing date -
Aug 16, 1994
priority date (Note) -
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Abstract
A valve is provided in one of the accumulator oil passageways provided between the servo and the 2-3 shift valve of an automatic transmission to partially restrict or control the flow of oil to and from the servo and clutch, thus adjusting the timing of shifts from second to third gear. The added valve or metering device would allow for a size increase of an orifice from the manual valve while maintaining proper timing of the apply/release of the 3-4 clutch and 2-4 band. The invention allows larger oil volume for both apply/release of the 3-4 clutch and 2-4 band, decreasing clutch failures and increasing transmission life expectancy. The invention is particularly advantageous with THM 700-R4 and 4L60-E automatic transmissions for 4-, 6- or 8-cylinder vehicles.
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