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2018 Sierra 1500 8-Speed Transmission Shudder - Is This Normal?

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Mark S. · rep 0 · May 22, 3:47 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 noticed a distinct shudder or vibration, especially when accelerating lightly between 30-50 mph. It feels like driving over rumble strips for a few seconds.

I've heard about issues with these 8-speed transmissions. Is this a common problem? My truck has about 65,000 miles on it, and I'm worried about long-term reliability.

Has anyone else experienced this? What was your fix? Should I be looking into a transmission flush or something more serious? Any advice would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:47 AM

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ClearTheCode guidance (Gmc · Buying & ownership)

Summary: For 2018 Sierra 1500 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 noticed a distinct shudder or vibration, especially when accelerating lightly between 30-50 mph. It feels like driving over rumble strips for a few seconds.

I've heard about issues with these 8-speed transmissions. Is this a common problem? My truck has about 65,000 miles on it,…

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

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