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shifting problems

  1. 1994 Chevy C1500 - 4L60e Transmission Repeatedly Bogs and Surges Between 3rd and 4th

    Transmission - Rearend
    Hi All, I have a 1994 Chevy C1500 with a 5.7 and a 4L60e trans. Odometer has 319k miles. This truck is rarely on the freeway. The few times I have been on the freeway, I have noticed that it surges and bogs a lot between third and fourth gear., like the transmission can't decide which gear...