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Replacing Oil, Filter, and Seals in GMC Sierra Automatic Transmission

Model: GMC Sierra MK 5 - Years 2019-2026
Part: Transmission fluid

Maintaining the automatic transmission is essential to preserve its lifespan and efficiency. For the GMC Sierra, start by removing the oil pan, where you will find the magnet that collects metal shavings. This magnet must be removed for thorough cleaning. Next, replace the filter, seals, and actuator springs, which should be replaced since they are constantly under stress. After installing all the replacement parts from the kit, refill the transmission with the appropriate oil, ensuring to check the level.

Updated on 29 May 2026 by ScegliAuto

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