One problem related to transmission not engage has been reported for the 2001 Chevrolet C3500. The most recently reported issues are listed below.
On numerous occasions transmission has failed to engage after coming to a stop. The vehicle has also on numerous occasions surged while easing out into traffic, almost causing accidents. The vehicle also feels like it is being bumped from behind on occasion. These problems are not consistent, but I have noted on the deiselpage. Com that others also have this problem.