If you place the transmission in second gear, it will never downshift or upshift out of 2nd, even from a complete halt, unless you move the change lever. Generally, the automatic gearbox employs a roller clutch for regimen upshifts/downshifts. It operates similar to a ratchet. It transmits the torque only https://simoncjlnn.blogpayz.com/33806918/a-review-of-gearbox-auto