I am using the stock AX-15 for now. I plan on upgrading the transmission down the road, after my funds recuperate from the engine. There are guys out there running AX-15 with the cummins and have had no problems. I will try it until it proves me otherwise.
"We have enough youth, how about a fountain of smart"
"Look no further than yourself, for all of the good and all of the evil that exist in this world, resides in the heart of man and his propensity to use it".