Here is the section from the transmission that hooks up for the push shaft -- Therefore if this section can't spin, the car are not able to shift. By locking different areas of the equipment set, the transmission can produce distinctive gear ratios without shifting gears in the normal sense. https://gearboxauto43073.luwebs.com/34835351/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox-auto