I changed the stereo out and when I did. I blew some fuses. I put the new fuses in that I blew and now my transmission is messing up. My car has to be showing 3000 rpm before it will shift any gear and i don't think it has over drive. Cause at 70 mph I'm running 3100 rpm I dont have a clue if this is normal. Can someone please help me or lead me in the right direction thank you