2003 Mustang Gt Slow In 3rd Gear

While we are back to life i might as well say what my issue was:
4.56 gears ! lol
Stock tires + 4.56 gear = spin 1st , second, and sometimes the beginning of third if i dont shift into gear fast enough when in clutch. I topped out at 68mph until i removed my Speed Sensor then i was able to hit 98mph (only in a manual trans car can do this) .

(added to post):
The reason it SEEMED slow in third gear was because i shifted into third so quickly. When it finally gained traction i was really suppose to be in 2nd gear.
So when i finally gain traction in third i should shift back down to second. Shifting with wheel torque is an art for sure.