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Message:: [QUOTE="NEXTWEEK, post: 1166049, member: 42"]I figured out my mistake the RN4F31A in the B12 has a 3.650:1 diffrential.The B12's RS5F31A has a 3.895:1 diffrential.Where they say it is the final frive ratio I was confused, they are talking about the diffrential's gearing, not the overall ratio between the input and output shaft.So the B12 Sentra's 5 speed overall ratio would be:5th gear (.733:1)X diff ratio (3.895:1)= 2.855:1 and the B12 Sentra's 4 speed overall ratio would be :4th gear (.902:1)X diff ratio (3.650:1)= 3.292:1 and the N13 Pulsar's 5 speed overall ratio would be:5th gear (.756:1)X diff ratio (4.167:1)= 3.150:1That means for the transmissions that the N13 Pulsar's 5 speed is slightly higher geared than the 4 speed from the B12 Sentra To compare 3,000 RPM in Sentra 5 Speed= 73MPH3,000 RPM in Sentra 4 Speed= 63MPH3,000 RPM in Pulsar 5 Speed= 66MPH 2,000 RPM in Sentra 5 speed= 49MPH2,000 RPM in Sentra 4 speed= 42MPH2,000 RPM in Sentra 5 speed= 44MPH<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" />[/QUOTE]