Pull the pan and look at the pan bottom and filter. Sometimes a worn transmission will have so much friction material in the pan, it tends to get picked up and clog the filter at higher RPMs. Shutting down and letting the silt settle a bit will sometimes get you home at low RPMs.

If this is true, you will have a gray silt coating in the pan. This probably means that the transmission has been slipping and is worn out. With a clean filter and new fluid, it might last a bit longer if the clutches aren't slipping, might not.

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Gone to the dark side

- Jeff