Looking at buying at 1997 2500 diesel, it's supposed to be a "heavy half". I know what that means for the most part but if anyone wants to add their info please do so. This truck has 90,000 original miles. it was pulled out of the shop two years ago, and has had nothing but problems, but the owner has gotten everything fixed,,,,,,,,,,, so far,,,,,,,,,, it starts, and runs like a champ, well now the transmission is not shiftiing right will not shift into up shift into gear untill the fluid heats up. Any ideas,,,,,,,,,,,, or comments in the 6.5 motor. I am all ears