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  2. Overdrive (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Overdrive_(mechanics)

    The rotational speed of the wheels for that given forward speed is simple to calculate, being the tire circumference multiplied by the RPM. [a] As the tire RPM at maximum speed is not the same as the engine RPM at that power, a transmission is used with a gear ratio to convert one to the other. [b]

  3. Ford AOD transmission - Wikipedia

    en.wikipedia.org/wiki/Ford_AOD_transmission

    The "70" may also refer to the transmission's torque capacity after torque converter multiplication which occurs at low RPM when the torque converter is more "elastic". 4R70W indicates 4 gears, Rear wheel drive and Wider gear ratio compared to the AODE. The gear ratios are: First: 2.84 :1; Second: 1.55 :1; Third: 1.00 :1; Overdrive: 0.70 :1 ...

  4. GM 4L60-E transmission - Wikipedia

    en.wikipedia.org/wiki/GM_4L60-E_transmission

    The police package (9C1) B-body cars featured a First Gear Block Out (FGBO) Plate on the transmission housing to prevent drivetrain damage. The shift point for first to second gear is about 43 MPH (69 km/h) while second to third gear shift point is about 83 MPH (134 km/h) assuming a 3.08:1 differential and a 5,500 RPM engine speed limit.

  5. Toyota U transmission - Wikipedia

    en.wikipedia.org/wiki/Toyota_U_transmission

    5 speed automatic transaxle (4x4) ... The U250E is a 5-speed version of the U241E. Gear ratios ... 6 speed automatic communicates with engine to calculate torque with ...

  6. Toyota W transmission - Wikipedia

    en.wikipedia.org/wiki/Toyota_W_transmission

    1st and 2nd are low ratios like in the W56 for use to get a heavy vehicle moving. 3rd ratio is the same as in the W57/W58 for a lower rpm drop between 3rd & 4th useful in high-speed acceleration. 4th is direct 1:1 as per design in these boxes. 5th seems to be the base W55 overdrive ratio. Ratios: First Gear: 3.954:1; Second Gear: 2.141:1

  7. ZF 4HP transmission - Wikipedia

    en.wikipedia.org/wiki/ZF_4HP_transmission

    The 4HP is a 4-speed Automatic transmission family with a hydrodynamic Torque converter with an electronic hydraulic control for passenger cars from ZF Friedrichshafen AG.In selector level position "P", the output is locked mechanically.

  8. GM 4T40 transmission - Wikipedia

    en.wikipedia.org/wiki/GM_4T40_transmission

    The "MN4" 4T40E is able to handle vehicles up to 4000 lb (1814 kg) GVWR. The final drive ratio can vary depending on the car's curb weight and engine power output. 3.91, 3.63, 3.29, 3.05, 3.69, and 3.42 are all of the available ratios used in the 4T40 (and 4T45) transmission; Made possible by using combinations selected from 3 different sprocket combinations (32/38, 35/35, 33/37) and 2 ...

  9. Gear train - Wikipedia

    en.wikipedia.org/wiki/Gear_train

    The gear ratio also determines the transmitted torque. The torque ratio TR AB of the gear train is defined as the ratio of its output torque to its input torque. Using the principle of virtual work, the gear train's torque ratio is equal to the gear ratio, or speed ratio, of the gear