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2018 Silverado 8-speed Transmission Shudder - Fluid Flush Needed?

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Kevin B. · rep 0 · May 22, 2:38 AM · 1 replies · solved · Question

Hey everyone,

I've got a 2018 Chevrolet Silverado 1500 LTZ with the 5.3L V8 and the 8-speed automatic transmission. Lately, I've been noticing a distinct shudder, especially when accelerating lightly between 40-60 mph. It feels like driving over rumble strips for a few seconds.

I've read online that this is a common issue with these transmissions and might be related to the transmission fluid. Has anyone else experienced this? Is a transmission fluid flush and refill with the newer Mobil 1 LV ATF HP fluid the recommended fix? I'm trying to figure out if this is something I can tackle myself or if it's a dealer-only job. Any advice on the process or specific fluid types would be greatly appreciated!

Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:38 AM

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ClearTheCode guidance (Chevrolet · Maintenance & DIY)

Summary: For 2018 Silverado 8-speed Transmission Shudder - Fluid Flush Needed?, 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 Chevrolet Silverado 1500 LTZ with the 5.3L V8 and the 8-speed automatic transmission. Lately, I've been noticing a distinct shudder, especially when accelerating lightly between 40-60 mph. It feels like driving over rumble strips for a few seconds.

I've read online that this is a common issue with these transmissions and might be related to the transmission fluid. H…

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

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