Oh, duh .my speedo has been wrong for so long I forgot, after putting in the 3.23 gear. My speedo was hitting over 100 when rpms were at 3500, which I rounded up to 105. I seemed to guess that speedo was about 8-10mph faster than actual, but, no way is it that off. What gives here.
Anyway, the point I wanted to make was that 6K rpm is not a reality with my auto.
All depends on what tires and gears the car came with and what's on it now . It's surprising how off some speedometers can be . You can always buy a gear for the transmission once you know tire size and gears to correct it .