1996 Plymouth Voyager Speed Meter Drops to Zero and Gear sw

This problem started month ago, when somethings van runs as normal. But often now van would hesitate to pickup speed after 30mph feels like transmission won't switch gears to 3rd and 4th speed. RPM would run high passing 3000 - 4000 and speed would stay 40mph if press gas to highway speed.

Speed meter would drop to zero when slowing down or hit brakes.

Please advise Thanks,
G