RE: transmission problem shifting 2nd to 3rd
Hi. Had the same problem on my -98 2500 after a total rebuild of the transmission. Took it back to the shop, and they found that one of the valves was cloged with particles from the new bands or lock up cluch. They showed me the valve, and it looked like it hade som kind of mesh filter in front. This filter was cloged. They replaced the valve, and all problems gone.