For all TJs with the exception of the Rubicon which has the same axle front and rear, there is a .01 ratio difference between the front and rear due to the difference in f/r ring gear sizes. So Jeeps come with these combinations of f/r ratios... 3.07/3.08, 3.54/3.55, 3.73/3.74, 4.10/4.11.
The .01 ratio difference is ok due to our 4x4 system being designed for loose low-traction road surfaces. Even if they were exactly the same however, you still couldn't drive in 4x4 on the street since the front axle turns faster than the rear axle does on curves and turns. Offroad, it's a non-issue.