ANSWERS: 1
  • Prior to the advent of lock-up converters, automatic transmission had a reputation of poor fuel mileage when compared with that of manuals. The lock-up feature enabled by a torque converter's internal clutches is what allows modern automatics to buck this stigma.

    Torque Converter Function

    A torque converter uses an engine-driven turbine to push fluid through a transmission-side impeller. Though this design does function effectively, it allows internal leakage and inefficiency at cruise speed.

    Lock-Up

    Lock-up converters use a set of internal clutches to lock the engine and transmission together at a certain speed, allowing the drive to attain nearly 100-percent efficiency.

    Configuration

    The TC clutches are arranged in much the same way as those in the transmission. They consist of a series of alternating clutch ring and pressure plates that get squeezed together on engagement.

    Activation

    TC clutches are electronically activated, usually in one or both of the transmissions top gears.

    Failure

    TC clutch failure can be recognized by a marked shudder that occurs after the top gear shift. This is usually preceded by a noticeable drop in fuel economy.

    Source:

    Rod and Custom Magazine: Understanding Torque Converters

    Car Craft Magazine: What's up with Stall?

    Chevy High Performance Magazine: TCI transmission and Torque Converter Technology Insights.

    Resource:

    youtube.com: Lock-Up Kit Explaination (Video)

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