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2019 Ram 1500 Rebel 8-Speed Transmission Shudder - Light Acceleration

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Ashley M. · rep 0 · May 22, 3:37 AM · 1 replies · solved · Question

Vehicle: 2019 Ram 1500 Rebel

I've got a 2019 Ram 1500 Rebel with the 5.7L Hemi and the 8-speed automatic transmission. Lately, I've noticed a distinct shudder or vibration when I'm lightly accelerating, especially between 40-55 mph, which feels like it's happening during the 4th to 5th gear shift. It's not a harsh jolt, but more of a subtle, unsettling vibration that goes away once I'm fully in gear or accelerate harder.

I'm worried this could be a sign of a bigger transmission problem. Is this a known issue with the 8-speed ZF-derived transmission in the 2019 Rams? What should I be looking for, and what are the potential fixes? I'm still under warranty, but I want to be informed before I take it to the dealership.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:37 AM

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ClearTheCode admin answer:

Transmission shudder during light acceleration, particularly in the mid-range gears (like 4th to 5th), is a recognized concern for some 2019 Ram 1500 owners with the 8-speed automatic transmission. This issue is often related to the torque converter or transmission fluid.

  1. Common Causes:

    • Torque Converter Clutch (TCC) Issues: The most frequent cause of this type of shudder is the torque converter clutch failing to engage or disengage smoothly. This can be due to wear, internal fluid pressure issues, or software calibration.
    • Transmission Fluid Degradation: Over time, transmission fluid can break down, losing its lubricating and friction-modifying properties, leading to shudder. Even if your truck isn't due for a fluid change, fluid condition can be a factor.
    • Software Calibration: Sometimes, the transmission control module (TCM) software can be updated to improve shift quality and address shuddering issues.

  2. Diagnostic Steps:

    • Check for TSBs: Ram has issued Technical Service Bulletins (TSBs) related to transmission shudder and torque converter issues for various model years. A dealership can check if your VIN is covered by any relevant TSBs.
    • OBD-II Codes: While not always present for a subtle shudder, a failing torque converter can eventually trigger codes such as:
      • P0741: Torque Converter Clutch Circuit Performance or Stuck Off
      • P1740: Torque Converter Clutch Solenoid Circuit Performance
    • Fluid Inspection: A mechanic can inspect the transmission fluid for color, smell, and presence of metal particles, which could indicate internal wear.

  3. When to See a Shop:

    • Given that your truck is a 2019 model, it's very likely still under the powertrain warranty. You should take it to a Ram dealership as soon as possible. Explain the symptoms clearly, noting the speed and gear range where the shudder occurs. They will perform diagnostic tests, check for TSBs, and potentially update the transmission software or, if necessary, replace the torque converter or perform a transmission fluid flush. Addressing this early can prevent more significant transmission damage down the road.
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