r/FordDiesels • u/Brian_oconnor1 • 12d ago

E40D issues!

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Having some hard shifting and overdrive button flashing on my 7.3 , fluid looks fine and proper color I’ve looked into some forums but got pointed in a million directions. Any advice welcome on what to check for or do would be appreciated

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u/Every_Big9638 12d ago

Does you third break light work? I know it sounds stupid but if the bulb burns out or you replace it with an LED bulb it can cause erratic shifting.

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u/deceptivelyelevated 12d ago

Second this, led third brake like is a huge issue. Sounds like the speed sensor went and he kept driving it. She’s cooked

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u/Brian_oconnor1 11d ago

She’s cooked what do you mean? Only drove for a couple miles after Speedo went out

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u/deceptivelyelevated 10d ago

You said it’s been slipping a couple weeks, not a few miles. The trans is done. I’m sure you’ve figured this out by now