I just today replaced radiator on wife's 2004 Neon 4 cyl. auto trans. I drove it and it now has no speedometer. Also the car starting revving uncontrollably and bucking. This could be due to the hose from throttle body/air filter box fell off while she test drove it.

The whole radiator replacement was due to her hitting a critter and it broke the trans line into radiator. I'm wondering where the speedo is located on the transaxle? And if you believe that's the problem? Jim