The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Rough Shifting on 2022 Ram 1500 Big Horn (ZF 8-Speed)

0

Eric V. · rep 0 · May 22, 3:37 AM · 1 replies · solved · Question

Vehicle: 2022 Ram 1500 Big Horn

I recently bought a 2022 Ram 1500 Big Horn with the 5.7L Hemi and the ZF 8-speed transmission. I've only got about 25,000 miles on it, but I've started noticing some really rough shifts, especially when going from 1st to 2nd, and sometimes 2nd to 3rd. It feels like a hard clunk or jolt, particularly when accelerating from a stop or at lower speeds.

It's not constant, but it's happening more frequently now. I'm concerned about the long-term reliability of the transmission. Is this a common issue with the ZF 8-speed in newer Rams? Could it be a software issue, or am I looking at a more serious mechanical problem? Any advice on what to check or ask the dealer about?

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

The ZF 8-speed automatic transmission (8HP70/8HP75) in your 2022 Ram 1500 is generally considered robust and reliable. However, reports of rough or clunky shifts, especially in the lower gears, are not unheard of. With only 25,000 miles, it's definitely worth investigating.

Here's what could be causing it and what steps to take:

  1. Common Causes:
    • Adaptive Learning: These transmissions have adaptive learning capabilities. Sometimes, aggressive driving or unusual driving patterns can cause the transmission's computer to adapt to less-than-optimal shift points. A 'transmission reset' (often done by disconnecting the battery for a short period or via diagnostic tool) can sometimes clear these learned parameters, allowing it to relearn.
    • Software/Firmware Updates: Ram frequently releases software updates for the Powertrain Control Module (PCM) and Transmission Control Module (TCM) to refine shift logic, improve drivability, and address specific issues. Your truck might be due for an update.
    • Low or Contaminated Fluid: While less likely at 25,000 miles unless there's a leak, low or degraded transmission fluid can cause shifting problems. The ZF 8-speed is considered 'fill for life' by some manufacturers, but fluid degradation can still occur.
    • Valve Body Issues: The valve body controls fluid flow to the clutches. Issues here can lead to erratic shifting.
    • Torque Converter: A failing torque converter can sometimes cause shuddering or harsh engagement.
  2. Diagnostics: A dealership or transmission specialist can connect to the vehicle's computer to check for any stored transmission-related fault codes (e.g., P0700 series codes). They can also monitor live data during a test drive to observe shift pressures and solenoid operation.
  3. When to See a Shop: Since your truck is still relatively new and likely under warranty, your first step should be to schedule an appointment with a Ram dealership. Explain the symptoms clearly. Request them to:
    • Check for any applicable TSBs or software updates for the PCM/TCM.
    • Perform a diagnostic scan for transmission fault codes.
    • Inspect transmission fluid level and condition (though often not serviceable without special tools).
    • Perform a transmission adaptive learning reset if no other issues are found.

Don't delay, as persistent harsh shifting can accelerate wear on internal transmission components.

Menu

Help & account