2nd, there is no gear shift in an automatic transmission motor vehicle, so when you finally put the transmission into push, every thing else is automatic. Handbook transmission went via a number of progress and versions as auto manufactures experimented with layout. Primary Shaft is also referred to as output https://gearbox-auto19527.answerblogs.com/34362925/the-fact-about-gearbox-auto-that-no-one-is-suggesting