Originally Posted by KawiMonsterSahara
theres really not a big enough difference... 5 speed gives you better capability off road cuz you have more to work with in each gear versus the 6 speed...
I'm going to have to disagree with you here
Having had both the AX15 and the NSG370 transmissions, I like the 6 speed more. First gear is 4.46 vs 3.83
on the AX, which gives you a better crawl ratio no matter which T-case, or axle gearing you're running. Which is important for a manual tranny Jeep because you don't have the Torque converter working for you like in the auto.
Second through 4th are closely spaced at 2.61, 1.72, and 1.25, which is nice on and off road, 5th gear is your 1:1 and finally 6th gear is a numerically higher overdrive at .84 vs .79
which gives a non-aerodynamic Jeep with big tires and such a MUCH better overdrive. With the AX15, if there was even a small hill, I had to downshift. Not so with the 6 speed.
So IMHO, the 6th speed is a much much better manual transmission for the TJ, especially if you're lifted, etc.