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torque converter

  1. torque converter not locking or no overdrive?

    Transmission & Rearend
    Howdy, Im not really sure what it could be but my truck is revving 2400rpms going 95K down the highway while my mothers sonoma does 1800-2100 at 100-115K, would this be my torque converter not locking up or overdrive not kicking in or maybe both? my mpgs are really suffering from this, also my...