Looking for some advice concerning my runs. So I'm asking some questions and looking on the internet at some calculator comparisons, the car running the E.T.'s and MPH tells me with the combination of ring & pinion, tire height and trans that I should only be trapping about 5500 RPM's approximately. Well, I'm crossing at about 6600 RPM's give or take, I'm shifting from low into high at about 6800-7000. Does this sound like a loose converter to anyone else, give me some insight.