On a trip today we were driving down the Interstate when all of the sudden the RPMs went way up and we lost all power.

We managed to get off the road, and some experiments, at 25MPH it would basically shift into neutral if it was in (Over)drive or 3rd. In 2nd gear it would stay in gear, just keep increasing RPMs. At one point I was in 2nd gear, heading up a hill, and shifted it into 3rd and it actually shifted into 3rd, but it was probably around 3-4k RPMs at that point. It did stay in gear until I let off the throttle.

We thought it might be the speed sensor but... well, we just replaced that and it's still doing the same thing. I did notice that the plug was pretty oily, I'm not sure if that would do anything.

Any clue what's going wrong here (and more importantly, how much I should expect to repair it)? I saw a couple of things that talked about something called a sprag, or some sort of solenoid, but I'm not sure if any of those apply.

  • Any transmission codes in the computer?
    – Moab
    Feb 9, 2019 at 15:54
  • No check engine light Feb 9, 2019 at 15:55
  • That's not what I asked, there can be stored codes without a light.
    – Moab
    Feb 9, 2019 at 15:59
  • Apparently I have no idea :) can an auto parts store check that? Feb 9, 2019 at 16:47
  • Yeah, most parts stores can pull codes for free.
    – Moab
    Feb 9, 2019 at 17:20

1 Answer 1


As it turns out - it was the transmission, it needed a rebuild and now it's all good.

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