i know some stuff about cars but i was just wondering what wheel spacers are and also what the shifter rod is. I was wondering about the shifter rod because ive heard that there's a lot of problems with it. I think mine might be bad because my car is showing the same symptoms that everyone elses does that have a bad shifter rod, my car sometimes makes like a metal sliding noise when i shift into second. Also soemtimes after driving for a little while my engine temp gauge will drop back down to zero then slowly come back up. If anyone could help me with any of the above questions it would be greatly appreciated.