The cars engine computer (ECM) and transmission computer (TCM) work very hard to optimize every part of a shift. (humblemechanic.com)
For example, a Ford TSB released in September 2011 advised dealers to reprogram the transmission computer if 2011 Ford Fiesta owners complained about «hesitation when accelerating from a low speed after coast down, harsh or late 1 - 2 upshift, harsh shifting during low - speed tip - in or tip - out maneuvers and / or engine r.p.m. flare when coasting to a stop.» (carcomplaints.com)
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