It would not switch gears when going 65

Tiny
CRAZYFUNMEXICAN
  • MEMBER
  • 2003 DODGE RAM
  • 5.9L
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 222,000 MILES
Have the truck listed above 2500 turbo diesel 24v. It would not switch gears when going 65 and it jerks back to 60 and then let it go and then right back to jerking back to 60 does it for 10 20 30 40 and 50. There is no engine light and I went to a mechanic and they cannot find nothing on their computer. I have changed 1 near the transmission oil transmission speed sensor, fuel filter, front and rear differential fluid, change the coolant radiator, water pump, then change the motor oil and filter. Please help me.
Tuesday, October 15th, 2019 AT 2:19 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Welcome to 2CarPros.

Do you mean that once at 65 it will not downshift? Do you mean it won't shift to overdrive? If you making it to that speed, it has to be shifting, so I am trying to narrow down what is happening.

There are several things that can cause shifting issues. Without a diagnostic trouble code from the transmission control module, it becomes a guessing game. For example, the overdrive overdrive solenoid may have failed or the torque converter clutch. These components are located on the transmission valve body which requires the pan to be removed. I don't want to suggest things and be wrong only to cost you unnecessarily. However, I will try to provide possibilities based on your answers.

Let me know,
Take care,
Joe
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Saturday, May 1st, 2021 AT 5:56 PM
Tiny
CRAZYFUNMEXICAN
  • MEMBER
  • 2 POSTS
Yes, downshifts I'm going to 60, 50, 40 and 30. Here is the video
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Saturday, May 1st, 2021 AT 5:56 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Welcome back:

No problem with the delay. I did see it. Is it downshifting or slipping? If it is downshifting which is what you originally said, the first thing I would do is have the TCM re-flashed to see if that remedies the issue. Since there is no trouble code and it is acting like that, the problem may be the programming. Also, since it does this at shift points, it could even be a transmission line pressure issue, but at this point, I'm leaning toward the TCM (transmission control module).

Was the mechanic certified on this type of vehicle? Was he able to do more than just check for codes?

Let me know.

Joe
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Saturday, May 1st, 2021 AT 5:56 PM

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