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This is a 2000 Ford E250.

The transmission slams into second gear when hot.

I pulled the valve body, and the accumulator seals and piston appear to be good. The 1-2 valve also seems fine.

Any ideas?

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    Get the valve body, seals and piston checked by an autobox specialist, in fact the whole box... – Solar Mike Mar 20 '18 at 20:35
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    Unless you have a good set of test gauges it will be difficult to diagnose yourself. However, if you know enough to pull the accumulator you might want to make the investment. I don't know which ports to check, but you need to consider mains and "throttle" pressures, along with the accumulator and 1-2 shift valve - you can't visually tell if it's sticking. The fact that it happens when hot points to a seal problem... I would have replaced the accumulator piston/seals when I had it out - cheap enough. How dirty was the fluid? mileage? Debris messing with a check ball? – SteveRacer Mar 21 '18 at 0:52
  • Still apart. I'll probably throw a new accumulator and spring in as well. Ordered another valve body too, should cover the bases. Thanks guys. – Derek Mar 21 '18 at 4:29
  • Couldn't get the accumulator piston but put new valve body and all seems well so far. – Derek Mar 22 '18 at 16:42

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