First off, I have a '87 K5 with 700R4 that was replaced (by dealer) with a factory rebuilt about 60K ago /forums/images/icons/smile.gif . When I go from park into overdrive (or any forward gear, not reverse) the truck will jump forward hard /forums/images/icons/shocked.gif . It will hold first gear untill maybe 30 (?) mph and then shift hard into second (pulled front end off the ground when it shifted as I went over a dip /forums/images/icons/cool.gif ). It will hold second untill roughly 55 mph and then shift to 3rd, and it hasn't yet shifted to fourth /forums/images/icons/mad.gif . If I mash the gas through the gears, it will shift smoothly into second and third. Also when the shift lever is in "3" and I am slowing to a stop it will downshift fairly hard into first, but this does not happen when the lever is in overdrive. The fluid level was fine and the color is good too /forums/images/icons/tongue.gif . Any advice on what to check or adjust? Doesn't it figure, my warranty just expired last month /forums/images/icons/mad.gif /forums/images/icons/tongue.gif !