AS68RC Planetary, used and ready to install. Fits the AS68RC. Ships fast from the USA.
A Ram 3500, 4500 or 5500 chassis cab that has started to howl in certain gears, left chunks of metal on the pan magnet, or lost drive after a hard pull usually ends up on a bench with its Aisin six-speed split open. When the teardown shows a ruined front gear train, this used AS68RC complete front planetary set is the factory hardware you need to put it back together. It is sold as a set, so you are not trying to pair a carrier from one transmission with mating pieces from another.
The AS68RC does not get its six forward speeds from a single compound gearset. It stacks three simple planetary sets, called P1, P2 and P3, and uses three drive clutches (K1, K2, K3), two holding clutches (B1, B2) and one one-way sprag to lock or drive different members of those sets. P1 is the front set. Each time the transmission control module changes the clutch combination, a different member of the gear train becomes the input, the reaction or the output, and the result is the published spread of 3.74, 1.96, 1.34, 1.00, 0.77 and 0.63, with a 3.54 reverse. Behind a 6.7L Cummins rated for heavy towing, the front set carries full engine torque in the low ranges, so its pinion needles, pinion shafts and thrust washers live a hard life.
Clutch failures are far more common in this unit than gear failures, and a burned K2 pack can make the same complaints about missing upper gears. Pull the pan, read the debris and check clutch apply before you blame the gear train. Our guide to P0730 gear ratio code diagnosis walks through separating a slipping clutch from a mechanical fault, and the AS69RC problems and service guide covers the later version of this same Aisin family.
With the unit apart, inspect every pinion for pitting, chipped teeth and side-to-side play, look at the carrier plates for cracks, and check the washers between the carrier and its neighbors for scoring. Metal that is mostly friction material points at a clutch; hard steel and pinion washer material points at a gearset. If only one piece of the front set is damaged, buying the matched set still saves you from guessing at wear on the parts that came out of your own unit.
This listing is not tied to a specific model year. The AS68RC was used behind the 6.7L Cummins in Ram 3500, 4500 and 5500 chassis cab trucks from the 2007.5 model year through 2012, and Aisin also built closely related versions for medium-duty trucks such as the Isuzu NPR (A465) and Mitsubishi Fuso (AS6). Transmission Digest notes those truck versions are slightly different from the Ram unit, so line up the photographs with the parts on your bench, compare tooth counts and spline engagement, and send us your year and VIN if you want a second check. If you need a dated part, our 2006-12 front planet and gear is also listed. More Aisin parts are in the Aisin transmission parts collection.
| Fits | AS68RC |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Ram 3500, 4500 and 5500 chassis cab trucks with the 6.7L Cummins from 2007.5 through 2012. Related Aisin versions were used in Isuzu and Mitsubishi Fuso medium-duty trucks, but they are not identical, so compare the parts before installing.
It is a used front planetary set from an AS68RC, sold as the pieces shown in the listing photos. Compare those photos to the parts in your transmission before you order, and contact us with your year and VIN if anything does not match.
No. Pump wear, bearings, the torque converter and driveline parts can whine too. A gearset whine changes with road speed and with the selected gear, and it is confirmed by inspecting the pinions during teardown.
It uses an Aisin-type ATF. Mopar ASRC is the factory fluid and Mobil 3309 is a common equivalent. Do not fill it with a generic Dexron or ATF+4.
Worn thrust washers and bearings, the filter, all seals and gaskets, and any clutches contaminated by the debris. Clean or replace the cooler so old metal does not return to the new parts.
