4spd High RPM in 3rd Gear?

It doesn't make sense logically is right but I do appreciate all the input.

I was driving it the other day and it seemed to act normal once in a while, so I'm thinking maybe something is broke and it's sometimes getting to third and sometimes not or something. Either way, sounds like I need to take this thing apart or put the one I know is good into it.

Sorry, haven't gotten around to putting the tach on it, it's been raining just about every day here and now it's getting ready to snow. Probably only have about one day of driving it left.