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Table 11 The gear ratios, interval of gear ratio and transmission efficiency of ZF 9HP

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

Gear Gear ratio Interval of
gear ratio
Transmission efficiency
Reverse gear − 3.80   0.8960
1st gear 4.70   0.9660
2nd gear 2.85 1.65 0.9738
3rd gear 1.90 1.49 0.9836
4th gear 1.38 1.38 0.9917
5th gear 1 1.38 1
6th gear 0.80 1.24 0.9855
7th gear 0.70 1.16 0.9878
8th gear 0.58 1.21 0.9778
9th gear 0.48 1.21 0.9736