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Alright everyone well, Ive been thinking if this sort of swap is possible and/or what are the benefits. I got this info from Honda's website. I live here in the state of Texas and we get he luxury of having 75 mph speed limits. I am dealing with a family member in the last stages of cancer and go and visit them every other week. Its a 4 hour drive! I drive an LX and from what I understand economy mode is up to 3500 rpms. At that engine speed I am going at about 78 mph :shadyhat: I was wondering if installing a 6 speed allow me to got at a higher speed and stay under 3500 rpms. I got this info from Hondas website but i dont know what it means. The one thing i do see is the automatic has better mpg's (besides hybrid) and it has a higher "final drive" than a manual. Could any transmission gurus chime in. I think/know I will probably need to get 6 speed axles and I dont know about flywheels, clutch assembly, trans mounts and such. I may need alot of other odds and ends but will a Si 6 speed ultimately give me better MPGs than a non-Si 5 speed

5-Speed Manual Transmission Gear Ratios: 1st: 3.143, 2nd: 1.870, 3rd: 1.235, 4th: 0.949, 5th: 0.727, Reverse: 3.308, Final Drive: 4.294.

5-Speed Automatic Transmission Gear Ratios: 1st: 2.666, 2nd: 1.534, 3rd: 1.022, 4th: 0.721, 5th: 0.525, Reverse: 1.956, Final Drive: 4.437

6-Speed Manual Transmission Gear Ratios: 1st: 3.267, 2nd: 2.130, 3rd: 1.517, 4th: 1.147, 5th: 0.921, 6th: 0.659, Reverse: 3.583, Final Drive: 4.765

2006 Honda Civic Coupe and Civic Si Specifications - Honda.com
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