I just replaced my heater core and bolted everything back together and was about to go drive it and I can't get it to change gears at all. Any suggestions?

 

column shift or floor shift? either way you overlooked something on reassembly!good luck!

 

Stick shift or Auto? If its a stick, check your trans fuild, could be very low or bad grears. On a Auto, You replace your heater cord right? I don't see how that ties in with the trans what so ever. Could be wrong...just don't how it could. Need more info.

 

Column shift, I found it already, it was a little cable on top of the column was broken.