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Message: <blockquote data-quote="cruiser78" data-source="post: 3662518" data-attributes="member: 63550">The Truth on 6 speed?Ehhh..... 6 speed is for cruising arr??? If i'm not mistaken, C160 got 4.5 final drive while C56 and C52 got 4.3 final drive.If that is true, 6 speed is made for better acceleration not for high speed cruising. Why am I saying this.. LETS CALCULATEImagine our beloved 20V's is running on 3000RPM at the top gear (5th for C52 and C56, 6th for C160)Given 3000 at crank will divide with the top gear ratio which is 0.815 for C52, C56 and C160 which is3000/0.815 = 3680.98 ----- this is the speed for the gear shaftthen divide again with final drive ratio which is 4.3 for C52 and C56 while 4.5 for C160 (6 speed)3680.98/4.3 = 856 RPM ----- this is the speed for our drive shaft and wheel using C52 or C56 transmissionbut for C1603680.98/4.5 = 817 RPM ----- the speed for drive shaft and wheel using C160. We can see it spin a bit slower than C52 and C56If we use 16 inch wheel with 45 series tyre, at 3000RPM with C56 (or 856 RPM on wheel) an AExxx cruises at 90 km/h, calculated travel speed versus RPM constant value is...90/856 = 0.105 ---- travel speed constant for C56,C52 and C160 using 16in with 45series tyreso we get vehicle travel speed for C160 at 3000 RPM is...817x0.105 = 85.785 km/hThats why I doubt about C160 giving better speed than C52 or C56. C160 only closes the ratio between gear but not a good fuel saver. I think most people will tend to use 6 speeder because it gives better acceleration. Maybe it reaches top power more easily as the engine will feel lighter to rev. I think its better to use a 6 speeder with either C52 or C56 final drive (if it fits)Bump: The chart given by mr scottwrx if I'm not mistaken is for the C60. That driveline is for 2ZZ-GE which fitted onto Celicas'. See the right side of the chart which states final drive 4.5 while the 6th gear is 0.725. The C160 is using 0.815 final drive with 4.5 final driveCan we fit C60 to 4A-GE. Do we need to change the bell housing? Will our 4A-GE have enough torque to fight travel resistance (air resistance, road surface condition, unsprung weight, inertia, etc)?</blockquote>