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Old 10-15-2020, 06:44 PM   #10
40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,774
Default Re: Fordomatic late shifting ('57 thunderbird)

As mentioned earlier, the throttle valve may not be properly indexed with the internal linkage. Have you had a pressure gauge on it? Use the port behind the throttle lever and compare pressure readings with the specs. in the manual. If the throttle valve is properly connected, check for wear in the governor valve bore. If the valve is too loose, fluid may be leaking past the valve, causing low governor pressure, thus causing late shifts.
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