How a 4-Speed Gearbox Works in 25 Seconds! (DIY Mini Car Transmission) | #hslab #automobile #shorts

Ever wondered how a 4-speed car gearbox really works? In this short video, I built a mini transmission using simple plastic gears and a DC motor to demonstrate how cars shift from 1st gear to 4th gear. Watch how gear ratios change speed and torque as I shift step-by-step! 🔧 What you’ll see: ✔️ 1st, 2nd, 3rd, 4th gear explained ✔️ Real gear ratio difference ✔️ DIY mini gearbox ✔️ Clear mechanical visualization If you love mechanical engineering, DIY builds, science experiments, or gear mechanisms, this video is for you! 👇 Comment which gearbox you want next — 5-speed, CVT, or differential! #Shorts #Gearbox #Engineering #DIYProjects #MechanicalEngineering #ScienceShorts #HS_Lab #Transmission #Gears #CarMechanism #STEM #HowItWorks #EngineeringShorts #MiniGearbox #DCMotor