Transmission Fluid Change | GMC Sierra 2500 HD (Step-by-Step DIY Service)

Learn how to perform a transmission fluid change on a GMC Sierra 2500 HD in this clear, step-by-step DIY guide. This tutorial covers everything you need to know to safely drain, refill, and service your heavy-duty truck’s transmission for smoother shifting and longer lifespan. 🔧 In this video, you will learn: • How to safely lift and support your GMC Sierra 2500 HD • How to drain old transmission fluid • How to refill with the correct ATF for heavy-duty GM trucks • How to check fluid level properly • Signs that your transmission fluid needs to be replaced • Tips to avoid overfilling or damaging internal components • Basic maintenance recommendations for heavy-duty GM transmissions 🚚 Compatible With: GMC Sierra 2500 HD — 2015–2024 (Allison and GM transmissions — procedure is similar) Chevrolet Silverado 2500 HD — 2015–2024 (same drivetrain family) Automatic Transmission Fluid Filter 👉 https://amzn.to/3Xcmm4n Automatic Transmission Pan Gasket 👉 https://amzn.to/4p6p8UY ULV Automatic Transmission Fluid 👉 https://amzn.to/4rcDvZu #ad Transmission Fluid Pump 👉 https://amzn.to/3QwGJtp Transmission Fluid Pump 👉 https://amzn.to/3QS4r3n Oil Pump 12V 100W 👉 https://amzn.to/4euns3Q 🔧 Top Tools I Personally Use – Reliable & Mechanic-Approved: #ad 🔩 Milwaukee M12 FUEL 2-Tool Combo Kit – Compact, powerful, and perfect for tight spaces. Great for everyday automotive or DIY work. 👉 https://amzn.to/3GTnPIp 🔧 Milwaukee M18 FUEL 1/2” High Torque Impact Wrench – Absolute beast for lug nuts, suspension bolts, and heavy-duty jobs. Tons of torque! 👉 https://amzn.to/4o7HHbp 🧰 8-Piece Mini Hook & Pick Set – Must-have for seals, O-rings, electrical work, and precision tasks. Durable and comfortable to handle. 👉 https://amzn.to/3IMtlx0 🛠 Milwaukee Shockwave 74-Piece Impact Driver Bit Set – High-quality bits made to last. Great variety for any job. 👉 https://amzn.to/3ILRPXg 🔧 BYNIIUR Trim Removal & Fastener Clip Tool Kit – Essential for interior panels, bumper clips, and wiring. Saves time and avoids damage. 👉 https://amzn.to/40Clecz 🧰 Milwaukee 1/4”–3/8” 106PC Ratchet & Socket Set – Versatile set with everything you need in a compact case. 👉 https://amzn.to/40GjZcm 🧤 MicroFoam Nitrile Coated Safety Gloves – Excellent grip and protection without losing finger sensitivity. Great for all-day use. 👉 https://amzn.to/4l2NFaF Or 👉 https://amzn.to/3U0qvqA