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  1. F

    4l80e dtc39 t/c o/d problems

    I have a 1993 7.4 k2500 with the 4l80e in it.the problem is when I start it and drive it it shifts great and tc locks great then about 2-3 miles cruising about 55 the tc will unlock and not lock again till I turn the truck off for 20 sec then start it again then everything all over. If I keep...
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