Why When you put your jeep wrangler 5 speed into fifth gear it doesnt seem to go faster?

Answer 1

5th gear in any five-speed transmission is not to "go faster" but to reduce the engine RPMs while maintaining a more-or-less constant highway speed. In this way, gas mileage can be increased and engine wear reduced.

In 5th, the engine does not have the torque necessary to accelerate unless going downhill or on a level road. When I drive at 70 mph in 5th, and am driving up a hill for over 1/4 mile, I frequently downshift to 4th if my speed drops off. After cresting the hill, and my speed has increased, I will upshift again.