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I have a 1996 full-size bronco with a 351W and an E4OD trans. I’m having to tach up to or past 3k rpm it to shift. It does way better in higher gears and reverse. Also, when i drop it into 1st and 2nd manually, it performs as it should. What’s going on here?

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    How many miles has it done? When was the trans fluid changed? Or checked? If the answers to these questions, in order, are : many, never, never... Then get it checked by a transmission specialist - it may need rebuild or replacement.
    – Solar Mike
    Commented Apr 17, 2019 at 5:38
  • Are there any vacuum pipes connected to the gearbox? If so, check that they are correctly connected and not leaking.
    – HandyHowie
    Commented Apr 17, 2019 at 10:08
  • 207k miles. I’ve owned the truck for two years and it hasn’t had trans serviced. I’m on it this week. Thanks Commented Apr 18, 2019 at 18:47

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