I have a 01 2500 tranny shifts fine when driving normal but when I get on it hard from the line shifting from 2nd to 3rd it seems like it will not engage in 3rd. It does not act like plates slipping but more like just going into nuetral. when you let off the pedal it will shift into 3rd hard. It will also do this when driving around 50 mph and romp on the pedal causing it to downshift. The engine is all stock with stock size tires. I bought the trruck from older gentleman that pulled a fifth wheel camper at 37,000 miles. It now has 105,00 miles and started this problem around 85,000. I have changed the fluid and filter and was not burnt and cut the filter open and did not see any serious metal. I am curious about this problem and have seen similar post but no serious answers thank for any help.