AS68RC Planetary 2008, used and ready to install. Fits the AS68RC. Ships fast from the USA.
If your 2007.5-2012 Ram 3500, 4500 or 5500 chassis cab with the 6.7L Cummins and the Aisin six-speed has a growl that changes with road speed, sent glitter to the pan magnet, or came apart with a damaged rear gearset, this is the part you are looking for. It is a used OEM No. 3 rear planetary assembly for the AS68RC, Mopar part number 68019894AA, removed from a 2008 Ram 4500 cab and chassis truck that came out of a good working transmission before the truck was parted out. Because new Aisin hard parts for this unit are expensive and slow to find, a clean used OEM gearset is often the practical way to get a work truck back on the road.
Transmission Digest describes the AS68RC as three drive clutches (K1, K2 and K3), two holding clutches (B1 and B2) and one sprag (F1) working through a triple planetary gear train labeled P1, P2 and P3. This listing is P3, the rear set. Different combinations of those clutches hold or drive members of the three gearsets to produce six forward ratios: 3.74, 1.96, 1.34, 1.00, 0.77 and 0.63, plus a 3.54 reverse. The two overdrive gears are what let a loaded chassis cab cruise at low engine speed. The unit is rated around 730 lb-ft of input torque, and a rear gearset in a dually hauler or wrecker sees that torque multiplied in the low gears every time the truck pulls away loaded.
A slipping clutch and a broken gearset can both set ratio error codes, so pull the codes and read our gear ratio code diagnosis guide before condemning hard parts. Slipping on this Aisin under load is most often a clutch or pressure problem, covered in Aisin slipping under load. A noise that follows road speed in every gear, along with steel in the pan rather than only friction material, points to a planetary. Once the unit is apart, spin each pinion and check for roughness, side play and heat color, and measure thrust surfaces using the thrust washer and end play guide.
This set came out of a 2008 Ram 4500 chassis cab with the 6.7L Cummins. The AS68RC was used in the 2007.5-2012 Ram 3500, 4500 and 5500 chassis cab only; Ram 3500 pickups of those years used the 68RFE, which this does not fit. The same Aisin six-speed also appears as the A465 in Isuzu and the AS6 in Mitsubishi Fuso trucks, but Transmission Digest notes those versions differ slightly from the Ram unit, so do not assume interchange outside the Ram application. Match the part number 68019894AA and compare your old carrier to the photos, or send us your year and VIN to confirm. For a different AS68RC gearset, see our 2006-2012 AS68RC planetary.
Clean the assembly, check pinion end play, and inspect the sun gear and ring gear splines before installing. Replace any thrust washers or bearings that show wear and set end play to spec. A gearset failure leaves debris through the whole unit, so the clutches, seals and filter should be renewed; the AS68RC overhaul kit covers gaskets and seals. Flush the cooler and lines thoroughly, since the AS68RC carries a large external cooler. Refill only with Mopar ASRC or Mobil 3309, the fluid specified for this transmission, and check the level hot.
| Fits | AS68RC 2008 |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
The AS68RC was used in 2007.5-2012 Ram 3500, 4500 and 5500 chassis cab trucks with the 6.7L Cummins. This set came from a 2008 Ram 4500. Match part number 68019894AA or send your year and VIN to confirm.
No. Ram 3500 pickups from those years used the 68RFE. The AS68RC was chassis cab only.
Used OEM, removed from a good working transmission when the truck was parted out. Only the planetary assembly shown in the photos is included.
They share the same basic Aisin design, but the Isuzu and Mitsubishi versions differ slightly from the Ram unit. We only state fitment for the Ram AS68RC.
Mopar ASRC or Mobil 3309. Do not use ATF+4 or a generic multi-vehicle fluid.
