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10511 Old Ridge Rd. Ashland, VA 23005
Powertrain Control Solutions
REV 1.1
Section 2 Transmission to Vehicle Interfaces
2.1 Transmission Input
2.1.1 Torque Converters
Power input and torque multiplication are accomplished by the transmission torque converter. Converters are
available with a variety of internal components that offer torque ratios up to 1.95 to 2.1 (Refer to Section 2.2.4).
A spring damper smooths out torsional variation when the converter clutch is locked. The correct choice of
components will result in a package that provides an optimum level of fuel economy, performance, and driveability.
We offer two torque converters, 258mm and 300mm. The 258mm torque converter is used in SAE4/SAE5
applications while the 300mm torque converter is used in SAE3 and GM 3.0L/4.3L applications.
300mm is used with SAE3, GM
3.0L & 4.3L applications
258mm is used with SAE4/SAE5
applications
Figure 2.1-1: Torque Converters
Common Name K Factor ST/Ratio
258 146 1.95
300 114 2.1
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