According to Ford, it is electronically limited to 150. That can easily be removed, but even with 410 gears, in 5th gear you will be able to reach 150.
What gear are you in when you hit 150 @ 5000+ rpms? The calculators just do not add up to that regardless of 3.55 or 3.27. With 4.10s, 5th gear should be exactly 150 @ 5000. Are you running tires way off from the stock size?