The transmission was only available in the Ram 3500, 4500, and 5500 chassis cab models. For the 2013 model year, Ram replaced the AS68RC with the AS69RC and extended its availability to Ram 3500 pickup models. Ram Trucks began using the AS66RC in chassis cab trucks for the 2014 model year - the two transmissions appear nearly identical. The Aisin AS68RC and AS69RC are also similar transmissions, the major differences being a slight variation in the 1st/2nd ratios and the suggested input torque of the AS69RC is marginally greater.
Aisin AS68RC Ratios
| 1st | 2nd | 3rd | 4th | 5th | 6th | R |
| 3.74 : 1 | 1.96 : 1 | 1.34 : 1 | 1.00 : 1 | 0.77 : 1 | 0.63 : 1 | 3.54 : 1 |
Aisin AS68RC Specs
| Transmission | Aisin AS68RC |
| Type | 6 speed automatic double overdrive transmission |
| Manufacturer | Aisin-Warner (Aisin Seiki Co., Ltd and BorgWarner joint venture) |
| Model Years/Applications | 2007.5 - 2012 Ram 3500, 4500, 5500 chassis cab w/ 6.7L Cummins diesel |
| Max Input Torque | 730 lb-ft |
| Max GCWR | 26,000 lbs |
| ATF Type/Spec | MOPAR ASRC or Mobil 3309 automatic transmission fluid |
| Transmission Filter | MOPAR 68019688AA |
| Features | • Mobile and static power take-off (PTO) provisions • Integrated Tow/Haul mode commands later upshifts and eliminates 6th gear (overdrive) from the shift schedule. Pressing the Tow/Haul switch a second time eliminates both 5th and 6th gears from the shift schedule. • Uses dedicated transmission control module (TCM) |