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Originally Posted by azn370z
The 5 speed and 7 speed are two very different transmissions. Nissan didn't just add two more gears. Read the pdf and check out how they're different.
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I didn't say Nissan just added two new gears.
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The 370Z’s new 7-speed automatic with Downshift Rev Matching (DRM) and Adaptive Shift Control (ASC) is designed to offer quick, manual-like shifting when operated in manual mode with a target time of 0.5 seconds between shifts. Drivers can use the standard paddle shifters or the shift lever. With new torque converter lock-up logic, the new 7-speed automatic feels more direct, like a manual transmission. The new 7-speed’s wide gear ratios offer improved fuel efficiency, while the Adaptive Shift Control is designed to adjust to the driver’s driving style.
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Most of these things were offered in the 5AT, such as the rev-matching and adaptive shift control after 2006. The only difference was the torque-converter lockup was different in the 5AT. In fact, even their model numbers are almost the same:
Jatco JR507E and Jatco JR710E.
Point being, the 7AT has different gearing ratios to make up for the two new cogs - but much of it remains the same, and was mostly carried over from the previous transmission.