68RFE Planetary 2007, used and ready to install. Fits the 68RFE. Ships fast from the USA.
Found glitter on the pan magnet of a 6.7L Cummins Ram, or pulled the case apart and found a reaction planet with chewed pinions or a blued carrier? This is a used 68RFE reaction planetary gear set, removed from a 2008 Ram diesel 68RFE that was parted out, and it is in good used condition. The photos show the exact assembly you receive: the carrier with its pinion gears and the mating ring gear, ready to go back into a 2007.5-and-later 68RFE behind the Cummins in a Ram 2500, 3500 or cab chassis truck.
The 68RFE builds its six forward ratios and reverse from three simple planetary gearsets, and the reaction set is one of them. Instead of bands, the unit applies two friction elements at a time - from the underdrive, overdrive and reverse clutches in the input housing, and the 2nd, 4th and low/reverse holding clutches - plus the low sprag. Each combination locks or drives different members of the three gearsets, and that is how the transmission gets 3.23 first, 1.41 third, direct fourth and 0.62-0.63 sixth. ATSG points out that all three 68RFE gearsets use six-pinion carriers to handle diesel torque and that they were sized to give the unit a deeper first and reverse than the gas RFE boxes. That six-pinion design is exactly why a gas 545RFE or 45RFE gearset is not a substitute here.
A speed-related whine on a Cummins truck is easy to blame on the wrong part. First rule out the pump: pump noise follows engine rpm, while gearset noise follows vehicle speed. Our 68RFE pump failure guide covers that split in detail. Then pull the pan and look at what is on the magnet. Clutch material and fine paste point to slipping frictions; chunky steel points to hard parts. If the truck has ratio codes, log input and output speed on a scan tool and compare them to the factory ratios before condemning anything - the 68RFE Ram 2500 Cummins problems guide walks through the usual failure chain. On teardown, check pinion end play, spin every pinion by hand for roughness, and inspect the sun and ring gear teeth and splines.
This reaction gearset came out of a 2008 diesel 68RFE, so it belongs in the 2007.5-up Ram 2500 and 3500 with the 6.7L Cummins and the cab chassis trucks that use the 68RFE. The 68RFE was revised several times, most notably for 2019, so compare this assembly to your original - tooth count, spline count, carrier height and the pinion layout in the photos - before you install. If you are unsure, send your year and VIN with your order and we will check it. Browse every part for this unit in our 68RFE parts collection.
A gearset that failed always leaves debris somewhere else. Flush or replace the cooler, clean every passage in the case, and replace the filter. Set the selective thrust washers and bearings to spec as you stack the geartrain, and replace any thrust bearing that is rough or shows pitting rather than reusing it. Most rebuilders do this job with a complete 68RFE overhaul kit so every seal and gasket is new, and a fresh 68RFE master rebuild kit covers the frictions and steels that usually took heat along with the gears. Refill with Mopar ATF+4 and set the level hot, at about 160 degrees F, as FCA specifies for this transmission family. If the truck has a modified engine or tows heavy, a complete 68RFE planetary set lets you replace all three gearsets at once.
| Fits | 68RFE 2007 |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is the reaction planetary gear set, one of the three gearsets in the 68RFE. It was pulled from a 2008 Ram diesel 68RFE. The photos are of the exact part you receive.
Do not use one. ATSG notes the 68RFE gearsets use six-pinion carriers for diesel torque and different ratios for a deeper first and reverse. Match this part to your original 68RFE gearset.
The 68RFE changed for 2019. Compare tooth and spline counts and carrier height with your old part, or send your VIN and we will check fitment before it ships.
Mopar ATF+4. Check the level with the fluid hot, around 160 degrees F, as FCA specifies for this transmission family.
Replace the thrust bearings and washers that show wear, the filter, and the gaskets and seals. A cooler flush is required after any hard-parts failure, because debris left in the cooler goes straight back into the new parts.
