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Rough/Delayed Shifts on 2020 Ram 2500 Cummins with 68RFE

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Ashley M. · rep 0 · May 22, 3:31 AM · 1 replies · solved · Question

Vehicle: 2020 Ram 2500 Big Horn

Hey everyone, I'm having some issues with the transmission on my 2020 Ram 2500 Big Horn, equipped with the 6.7L Cummins and the 68RFE automatic transmission. Lately, I've noticed some rough shifts, especially from 2nd to 3rd gear, and sometimes a noticeable delay when shifting into drive or reverse after starting the truck.

The truck has about 60,000 miles on it, and I haven't done a transmission fluid service yet, though it's coming up soon. There's no check engine light on, but the shifting feels off and sometimes a bit clunky.

Is this a common issue with the 68RFE? What could be causing these symptoms? Any advice on what I should check or if I should just take it straight to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:31 AM

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ClearTheCode admin answer:

Rough or delayed shifts on a 68RFE transmission in a 2020 Ram 2500 can be concerning, but there are several common culprits before assuming major internal damage. Given your mileage, a transmission service is definitely due and could be a significant part of the solution.

Here's a breakdown of potential causes and steps:

  1. Transmission Fluid Level and Condition:
    • Check: The first step is always to check the transmission fluid level accurately, following the procedure in your owner's manual (usually warm, in neutral or park, on level ground). Low fluid can cause delayed engagement and erratic shifting.
    • Condition: Note the fluid's color and smell. Burnt-smelling or dark, murky fluid indicates it's past its prime and potentially overheating, which can lead to internal wear.
  2. Transmission Filter: A clogged transmission filter can restrict fluid flow, leading to pressure issues and poor shifting. This should always be replaced during a fluid service.
  3. Software Updates: Ram often releases transmission control module (TCM) software updates to improve shift quality, address known issues, and optimize performance. A dealership can check if your truck has the latest calibration.
  4. Valve Body Issues: The valve body controls fluid flow to different clutch packs. Issues with solenoids or passages within the valve body can cause specific shift problems.
  5. Internal Wear: While less likely at 60,000 miles if well-maintained, excessive wear on clutch packs or other internal components can lead to slipping and harsh shifts.

When to See a Shop:

  • Immediately if the problem worsens, if you hear grinding noises, or if a check engine light illuminates (especially with codes like P0700 - Transmission Control System Malfunction, or specific gear ratio error codes like P0732, P0733).
  • Schedule a transmission fluid and filter service with a reputable shop. If the problem persists after the service and a software update, further diagnostic work, potentially involving pressure tests or internal inspection, would be necessary. A professional can use a scan tool to monitor transmission parameters and identify any abnormal solenoid operation or pressure readings.
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