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TableĀ 7 Transmission efficiency under each gear

From: Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions

Gear Transmission efficiency
Reverse gear 0.9482
1st gear 0.8879
2nd gear 0.9794
3rd gear 0.9333
4th gear 0.9774
5th gear 0.9821
6th gear 1
7th gear 0.9867
8th gear 0.9873
9th gear 0.9757