Today randomly i was driving and the revs were higher than normal. I was driving at 60mph and the revs are normally at 3k but for a bit they were at 3400ishk. I just changed the transmission fluid today and filled it up until the fluid started coming out of the filler hole. Everything was going well until then. It didnt sound like it was revving higher (not that i have notice at least)but the gauge was showing it. The speedometer sometimes freaks out at times when starting from a stop. Could this be a fluke or a speedometer cable problem or what?