One problem related to noises during shifting has been reported for the 1999 Chevrolet Astro. The most recently reported issues are listed below.
No reverse ! while driving, slowed down to make a rt. Turn heard a loud noise . The van then started to shift differently, like there wasn't a first gear . Drove van home parked it . Next day started van up went to shift in reverse van would not move. Shifted to drive and went forward. Park van in garage and looked at linkage under van saw no problems. Must be internal.