1989 f250 a/t not unlocking

Hi, I own a 1989 f250 2wd pickup with the 351 engine with 85000 original miles on it. I had the last tranny oil/filter change about

10000 miles ago. Anyway, starting last week, my truck will die everytime I come to a stop because it starts "lurching" as I'm stopping. It's like the transmission is not letting "go" for lack of a better description. (think of a manual transmission in 1st gear, and try to stop the vehicle without engauging the clutch) I'm having to shift into nuetral as I coast to a stop, then rev the engine a bit and pop it into drive to get going again. Another strange thing is..if I turn off the engine, then start it up, put it in drive and drive around slowly (like a parking lot) the transmission seems fine. I can come to a stop, and start going again normally. But every time I get up to more speed, like over 15-20 mph the tranny will not "let go" when I stop, and it lurches again, and the engine dies.

Note: Someone mentioned to check my brake lights as there is a circuit that causes the tranny to unlock. I did and they work

Anyone heard of this before? Ideas? Thanks, Rick

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Rick
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