Question about 1988 Ford F 150

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Trany slips out of over drive

My 91 f250 shifts fine from 1 to 2 gear but 3 is really tall and if it shifts into over drive it will be fine for a little bit and then it will slip out and rev the engine like it is in neutural. this is an auto trans. i change oil and filter and aded lucas. what could this be?

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  • Richard Scordino May 11, 2010

    Trans is "neutralizing" and is in need of rebuild

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On automatics the overdrive is actualy not in the trans at all
it's a small cluch in the torque converter and is not repairable, the only fix is to replace the torque converter, but then you say it races free as if not in drive?
That's a failure of the forward clutch

I'm afraid you need the trans overhaued, I recomend the dealership and NEVER places like Mr Transmission type, they'll overhaul it wihout any testing and cannot diagnose, just overhaul and overhaul ultil eother you're broke, or give up

In a 250 you most likely have either a C-6 (Aluminum case) or a FMX (Iron case) both are good transmissions and again the overdrive is the torque converter, be sure they replace it too

Good luck

Posted on Aug 30, 2009

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