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C6 transmission help

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Old Oct 5, 2025 | 02:40 PM
  #1  
Dkmauk13's Avatar
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C6 transmission help

Got a 85 f150 4.9l with the c6 transmission and I did a transmission filter and fluid change on it and it ran great for about to week. But now it won’t shift from 1st. But If I manually do it, I can go from 1st to 2nd using the shifter. And now if I drive around in 2nd It will randomly loose all power in the pedal for a few seconds until I left off. Anyone got any ideas or suggestions?
 
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Old Oct 13, 2025 | 09:50 AM
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You might try in the tranny forum.
https://www.ford-trucks.com/forums/forum69/

or in the normal threads in this forum.
 
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Old Oct 13, 2025 | 03:35 PM
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With the transmission warmed up, engine idling, and the shifter in park, where is the fluid level in the transmission? What ATF did you use?
 
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