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Rough Shifting & Delayed Engagement on 2018 Silverado 1500 - Time for a Transmission Fluid Change?

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Mark S. · rep 0 · May 22, 2:38 AM · 1 replies · solved · Question

Vehicle: 2018 Chevrolet Silverado 1500 LT

Hey everyone,

I've got a 2018 Chevrolet Silverado 1500 LT with about 85,000 miles on it. Lately, I've noticed some pretty rough shifts, especially from 1st to 2nd gear, and sometimes there's a slight delay when I put it into drive or reverse. It's not throwing any check engine lights, but it's definitely not as smooth as it used to be.

I'm wondering if it's time for a transmission fluid and filter change. I've heard mixed opinions on whether to flush or just drain and fill. What's the recommended service interval for these trucks, and what type of fluid should I use? Any advice would be greatly appreciated before I take it to a shop.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Rough shifting and delayed engagement on your 2018 Silverado 1500 at 85,000 miles are common symptoms indicating it's likely time for transmission fluid service. Chevrolet generally recommends a transmission fluid and filter change every 45,000-90,000 miles for normal driving conditions, or sooner for heavy-duty use (towing, hauling).

Here's what you should consider:

  1. Fluid Type: Always use the specified DEXRON-VI automatic transmission fluid. Using an incorrect fluid can cause further issues.
  2. Service Method: For higher mileage vehicles that haven't had regular transmission fluid changes, a drain and fill (often multiple times over a short period) is generally safer than a full flush. A flush can sometimes dislodge debris that then clogs critical components. A drain and fill replaces a portion of the old fluid with new, gradually improving fluid quality.
  3. Filter Replacement: Always replace the transmission filter during this service. A clogged filter restricts fluid flow and can contribute to your symptoms.

Causes of your symptoms:

  • Degraded transmission fluid (loss of lubricating and cooling properties).
  • Clogged transmission filter.
  • Worn clutch packs (less likely at this mileage without other severe symptoms).
  • Solenoid issues (less likely without a check engine light).

When to see a shop:

  • If the symptoms persist or worsen after a fluid and filter change.
  • If you notice any new noises, burning smells, or a check engine light (especially with codes like P0700 - Transmission Control System Malfunction).
  • If you're uncomfortable performing the service yourself, as it requires specific tools and knowledge to ensure proper fluid level and avoid contamination.
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