Originally Posted by halibuthays
Good to hear, and the reason i posted it is 2013 is the first year RAM put the AISIN in a truck smaller that a 4500 and it in combination with the high output CIMMINS it is producing a HUGE 850 ft lbs of torque... Probably not exactly what was in the old Toyota.
The Aisin was first put in the 4500 and larger 2007 with the Cummins 6.7l. Granted it was only putting out 650 ft pds of torque.
I suspect that they offered the Aisin in the 3500 due to customer demand vs the 68 rfe not
being stout enough.
My 07 3500 has a "bit" more than stock torque and the 68 rfe handles everything that I throw at it.
The 68rfe was designed and built specifically for the 6.7l.
Regular PM and keeping a close watch on the trans temperature when towing makes for a happy transmission.