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2018 Sierra 1500 8-Speed Transmission Shudder - What's going on?

0

Ryan M. · rep 0 · May 22, 3:39 AM · 1 replies · solved · Question

Hey everyone, I'm really frustrated with my 2018 GMC Sierra 1500 SLT, 5.3L V8. Lately, I've been experiencing a noticeable shudder or vibration, especially when accelerating at lower speeds, typically between 30-50 mph. It feels like the transmission is struggling to decide which gear to be in, or maybe it's slipping.

It's not constant, but it's happening more frequently now. I've heard about issues with the 8-speed transmission in these trucks, but I'm not sure if this is the 'torque converter shudder' people talk about. The truck only has about 70,000 miles on it, and I've kept up with all the scheduled maintenance.

Has anyone else experienced this with their Sierra? Is there a common fix or something I should be looking out for? I'm worried this could be a major repair.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:39 AM

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ClearTheCode guidance (Gmc · Engine & drivetrain)

Summary: For 2018 Sierra 1500 8-Speed Transmission Shudder - What's going on?, 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'm really frustrated with my 2018 GMC Sierra 1500 SLT, 5.3L V8. Lately, I've been experiencing a noticeable shudder or vibration, especially when accelerating at lower speeds, typically between 30-50 mph. It feels like the transmission is struggling to decide which gear to be in, or maybe it's slipping.

It's not constant, but it's happening more frequently now. I've heard about iss…

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

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