Just FYI, the '05 and '06 model TJ's have differently geared transmissions, which helps me out a little bit as well. See the difference below between the AX-15 and the NSG370:
AX-15 (5-speed):
1st - 3.83
2nd - 2.33
3rd - 1.44
4th - 1.00
5th - 0.79
Rev - 4.22
NSG370 (6-speed)
1st - 4.46
2nd - 2.61
3rd - 1.72
4th - 1.25
5th - 1.00
6th - 0.84
Rev - 4.06