I have a 99 with 200,000 mls on it. I was having the same problem but it seems to get worse as it heats up. We ran all electronic and manual shift tests, Pressure tests and taste tests we could. This showed some slippage and apparent wear on the unit.I figured I would go ahead and have the tranny overhauled. New converter all new seals, frictions and sensors. I even replaced the speed and cam sensors for good measure.After a complete go thru we found a broken acumulator spring a few burnt discs and overdrive piston and even a little dirt internally. It was finished early this morning. We hooked up the scan tool and went out for the road test. All pressure, shift and temp reading went right where the should be. However the drivability problems, eratic shifting and hanging in Low are exactly the same.Some shifts are even more agresive due to the fact that there isn't any slip now.If I run it wide open the red line it will shift. I am now leaning towards a bad program from my Superchips programer or a faulty pcu. I will be flashing the computer on monday. I will post my results. Any other input would be greatly appreciated........................ equally frustrated PaulyP
