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2018 Sierra 8-Speed Transmission Shudder - Is This Normal?

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Christine P. · rep 0 · May 22, 3:48 AM · 1 replies · solved · Question

Hey everyone, I've got a 2018 GMC Sierra 1500 SLT with the 5.3L V8 and the 8-speed automatic transmission. Lately, I've been noticing a distinct shudder or vibration, especially when accelerating gently from a stop or at lower speeds, usually between 20-40 mph. It feels like driving over rumble strips for a second or two.

It's not constant, but it's happening more frequently and it's quite unsettling. I've heard about issues with these transmissions, but I'm not sure if this is what people are talking about.

Has anyone else experienced this with their 2018 Sierra or similar GMC trucks? Is there a known fix or a TSB I should be aware of? I'm worried about long-term reliability.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:48 AM

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ClearTheCode guidance (Gmc · Buying & ownership)

Summary: For 2018 Sierra 8-Speed Transmission Shudder - Is This Normal?, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I've got a 2018 GMC Sierra 1500 SLT with the 5.3L V8 and the 8-speed automatic transmission. Lately, I've been noticing a distinct shudder or vibration, especially when accelerating gently from a stop or at lower speeds, usually between 20-40 mph. It feels like driving over rumble strips for a second or two.

It's not constant, but it's happening more frequently and it's quite unsett…

This is educational guidance, not a substitute for hands-on diagnosis.

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