I have a NV3500 in my '95 Cheyenne. I was just looking for other people's opinions, experiences, etc of or with the transmission. I know that when mine heats up, like a lot of in-city driving or a long distance drive, it doesn't like to shift smoothly. I think it is due to the oil change place not putting the synchromesh transmission fluid in it when it was serviced. Any ideas? Thanks, Mike.