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2018 Silverado 1500 Transmission Fluid & Filter Change - DIY or Dealer?

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Chris P. · rep 0 · May 25, 1:42 AM · 1 replies · solved · Question

Vehicle: 2018 Chevrolet Silverado 1500 LT

Hey everyone,

I've got a 2018 Chevrolet Silverado 1500 LT with the 5.3L V8 and about 75,000 miles on it. I'm starting to think about getting the transmission fluid and filter changed. I'm pretty handy with a wrench, but I've heard these newer transmissions can be a bit finicky.

Is this something a competent DIYer can tackle, or should I just bite the bullet and take it to the dealer? What kind of fluid should I be looking for? Any special tools or procedures I should be aware of for the 8-speed automatic?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:42 AM

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ClearTheCode admin answer:

Changing the transmission fluid and filter on your 2018 Chevrolet Silverado 1500 LT is a manageable DIY task for someone with moderate mechanical skills, but it does require attention to detail. Here's what you need to know:

  1. Fluid Type: For your 8-speed automatic transmission (likely the 8L90 or 8L45), you must use DEXRON-HP fluid. Using the incorrect fluid can cause significant transmission damage. Always verify the exact fluid specification in your owner's manual.
  2. Filter: Ensure you purchase the correct transmission filter kit for your specific 8-speed transmission. These typically include the filter and pan gasket.
  3. Procedure Overview:
    • Warm-up: Drive the truck for 15-20 minutes to get the transmission fluid to operating temperature.
    • Drain: Place a large drain pan under the transmission. Remove the drain plug (if equipped) or drop the entire pan. Be prepared for a significant amount of fluid (typically 5-7 quarts for a pan drop).
    • Filter Replacement: Remove the old filter, clean the pan and magnet(s), and install the new filter and gasket.
    • Refill: Reinstall the pan. Refill with the specified DEXRON-HP fluid through the dipstick tube or fill port. This is often the trickiest part as the fill level is critical.
    • Level Check: The 8-speed transmissions often have a specific temperature-based fluid level check procedure. You'll need a scan tool to monitor transmission fluid temperature (TFT). The fluid level is typically checked with the engine running, transmission in Park, and TFT within a specific narrow range (e.g., 86-122°F or 30-50°C). Fluid should barely drip from the check plug (often on the side of the pan) when at the correct level and temperature.

Causes of Transmission Issues & When to See a Shop:

  • Incorrect Fluid: Using the wrong fluid is the fastest way to damage your transmission.
  • Improper Level: Both overfilling and underfilling can cause shifting problems, overheating, and premature wear.
  • Contamination: If your fluid is very dark, smells burnt, or contains metal shavings, it indicates internal wear. A fluid change might help, but it could also be a symptom of a larger problem.

If you're uncomfortable with monitoring the transmission fluid temperature or performing the precise level check, it's best to take your Silverado to a qualified Chevrolet dealership or an independent transmission specialist. They have the necessary diagnostic tools and experience to ensure the job is done correctly.

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