Have a 2005 f150 4x4, when going up hills and u have to accerlate naturally rpm hand goes up when pass 2000 rpm it will make a harsh noise dosent make the noise when gearing down. have had to a garage had a transmission flush done they said there was no particles in the pan indicating that transmission wasnt gone. still making the same noise , can anyone give me any suggestion what the trouble could be. have had to another garage say it was shift syhloid.