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Message: [QUOTE="TD-5, post: 1379426, member: 12311"] Here's an excerpt from an article I found on the web, it kind of explains the torque & inertia phases of an up shift; "[I]A typical upshift event is divided into preparatory, torque, and inertia phases. During the preparatory phase, an on-coming friction element piston is stroked to prepare for its engagement while an off-going friction element torque-holding capacity is reduced as a step toward its release. During the torque phase, which may be referred to as a torque transfer phase, the on-coming friction element torque is raised while the off-going friction element is still engaged. The output shaft torque of the automatic transmission typically drops during the torque phase, creating a so-called torque hole. When the on-coming friction element develops enough torque, the off-going friction element is released, marking the end of the torque phase and the beginning of the inertia phase. During the inertia phase, the on-coming friction element torque is adjusted to reduce its slip speed toward zero. When the on-coming friction element slip speed reaches zero, the shift event is completed. [/I]" I also attached the article: [/QUOTE]

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