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1957 - 1960 F100 & Larger F-Series Trucks Discuss the Box Style Ford Trucks

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Old 10-01-2012, 03:06 PM
oldbmwrider oldbmwrider is offline
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Heavy duty three speed Transmission synchonizer

I have a 3 spd heavy duty trans. in a 1958 mercury half ton. It drops out of third gear when I go over 50 miles /hour unless I hold down the shift lever. I believe I need a new synchonizer for 2nd and 3rd gear. The part # I have is an old ford #. The synchonizer assembly # is B8QH - 7124 A. Does anyone know where to find one and is there anything else that could be the problem. I have also replaced the input shaft bearing and the output shaft bearing. This improved the problem but it did not fix it. Don
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