Transmission shifts just however it wants and speedometer wii jump around just before crazy shifting begains speedometer will hang up or not work at all what connects the two

. Check for codes:

https://www.askmehelpdesk.com/cars-t...tml#post832012

. Replace the Variable Speed Sensor (VSS), located on the transmission near the firewall--easy job.

Most likely, the VSS has failed. If the problem persists, check/replace the Transmission Control Module (TCM).