Automatic transmission gears (also known as the planetary gearset) is what makes multiple forward gears, a reverse gear, and a neutral possible. Have you ever wondered how it works? Watch this video to learn about basic, and compound planetary gearsets; sun gear, planet carrier, and ring gear (also known as annulus gear). Also learn about planetary gear ratios; gear reduction, direct drive, and overdrive. This video includes the 4L60E planetary gearset.

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PR Valve (Part 1):    • 4L60E Pressure Regulator Valve (Boost...  
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