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  1. Trans works fine until at operating temp

    Transmission & Rearend
    Hey all, I've got a 91 sonoma 4.3 4wd with the infamous 4L60. Upon first startup, the trans runs thru all gears with no problem, however, after running a few miles it hi-revs instead of shifting into third. I have to manually shift into first, then second. The first time it happened, I shifted...