47RE Planetary 1998, used and ready to install. Fits the 47RE. Ships fast from the USA.
This is the overdrive planetary gear set out of a 1998 Dodge Ram 2500/3500 with the 5.9L Cummins and the 47RE automatic, pulled when that transmission was parted out. If your truck howls only once it shifts into fourth, or you opened the overdrive housing and found a carrier with blued or chipped pinions, this is the gear set that lives back there. It is a four-pinion carrier with a steel cage, sold used, and the photos show the exact unit you receive. Because a factory 47RE carrier is not normally four-pinion steel, this one was most likely fitted as an aftermarket heavy-duty piece during an earlier rebuild.
The 47RE is a three-speed main case with a bolt-on overdrive unit behind it. The overdrive carrier is splined to the intermediate shaft coming out of the main case, and its annulus (ring) gear is held on the output shaft by a snap ring. In first through third, the direct clutch locks the gear set so the whole unit turns as one piece at 1:1. On the 3-4 shift the direct clutch releases and the overdrive clutch applies to hold the sun gear, so the annulus is forced to turn faster than the input. That is where the 0.69:1 fourth gear comes from. Every pound of torque from the Cummins passes through this housing in every gear, but the pinions only spin against each other in fourth.
A gear noise that only shows up in fourth points at the overdrive section, but rule out the easy causes first. Our 47RE common problems and fixes guide covers fluid level, cooler restriction and the overdrive clutch slipping under tow, which is the more common 47RE overdrive complaint. A whine that follows engine rpm in Park or Neutral is the pump, not the gear train. Once the overdrive unit is off, spin each pinion by hand, rock it on its shaft, and look at the annulus teeth and the sun gear for chips. The factory manual lists overall planetary end play at 0.006-0.048 in. for the 46/47RE.
This gear set came out of a 1998 47RE behind the 5.9L Cummins. The 47RE overdrive gear train is shared across much of the 1996-2002 run, but Chrysler made running changes to intermediate shaft and hub splines over the years, so count the splines on your old carrier and compare it side by side before installing. If you are not sure, send us your year and VIN and we will check it. The rest of the overdrive and gear-train parts are in our 47RE parts collection, and the rear-section gear set from a 1997 truck is listed as the 47RE rear planetary and ring gear.
| Fits | 47RE 1998 |
| 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 overdrive planetary, the gear set inside the overdrive housing at the back of the transmission. It is not the front or rear planetary in the main case.
In first through third the direct clutch locks the overdrive gear set so it turns as one piece and the pinions do not spin. In fourth the sun gear is held and the pinions do the work, so a worn overdrive gear set usually only makes noise in fourth.
The overdrive gear train is shared across most 1996-2002 47RE units, but spline counts on the hub and intermediate shaft changed over the years. Compare the splines on your old carrier with this one, or send us your year and VIN to check.
Four pinions in a steel carrier. It appears to be an aftermarket heavy-duty carrier fitted during an earlier rebuild rather than the original factory part.
Replace the overdrive and direct clutch packs, all seals and the case gasket, check the planetary thrust bearing, and set intermediate shaft end play with the correct spacer. Refill with ATF+4.
