47RE Planetary 1998-2003, used and ready to install. Fits the 47RE. Ships fast from the USA.
This is the part to look at if your 1998-2003 Ram 2500 or 3500 Cummins 47RE came apart with a front ring gear showing chipped teeth, a cracked gear, or a loose support hub. It is a used Dodge front annulus gear, the ring gear that wraps around the front planetary carrier, shown in the photos with its support plate attached. The listing identifies it with the five-pinion steel front planet used in these trucks. It is the ring gear only; the front planet carrier is not part of this item.
In the 47RE main case the rear clutch drives the front annulus gear. The rear clutch discs lug directly onto the outside of this gear, and the rear clutch is applied in every forward gear, so the front annulus is the input to the gear train in first, second, third and fourth. Inside it, the front planet carrier is splined to the intermediate shaft. In second gear the kickdown band holds the sun gear, the front annulus turns the pinions around it, and the carrier walks the output shaft at a reduced speed, which makes the front set the one doing all the work in second. That is the gear a loaded Cummins truck spends a lot of time in on hills and in town, and a hard 1-2 shift or a slipping band puts shock into these teeth.
Gear noise and slip share causes with fluid, cooler and band problems, so rule those out first. Our Ram 3500 Cummins shift problems guide covers band adjustment and pressure checks, and the 47RE pump guide separates a pump whine (present in Park, follows engine speed) from gear noise. With the unit apart, the factory rule is clear: replace an annulus gear if the teeth are chipped, broken or worn, or the gear is cracked, and replace any cracked, scored or worn thrust plates and tabbed washers.
Listed for 1998-2003 Dodge Ram 2500 and 3500 with the 5.9L Cummins and the 47RE (A618), with the interchange note covering 1996-2002 12-valve and 24-valve units and the five-pinion forward planet. Pinion count and spline details changed during the RE years, so set your old front ring gear next to this one and compare tooth count, the hub and the rear clutch lug profile, and make sure it meshes with the carrier you are running. Send us your year and VIN if you want us to check before shipping. All our hard parts for this unit are on the 47RE parts page.
A worn ring gear usually means the rear clutch pack is tired too; the 47RE clutch module covers that. While the gear train is out, inspect the sun gear driving shell and the rear planetary and ring gear.
| Fits | 47RE 1998-2003 |
| 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.
No. It is the front annulus (ring gear) with its support, the part that surrounds the front planet carrier. Reuse your carrier if it is in good shape, or replace it separately.
The listing identifies it with the five-pinion steel front planet. Check that it meshes fully with your carrier and compare tooth count with your old ring gear before installing.
It is listed for 1998-2003 Dodge Ram 2500 and 3500 with the 5.9L Cummins and 47RE. Send us your year and VIN if you are unsure.
The rear clutch. Its discs lug directly onto the gear, and the rear clutch is on in every forward gear, so this gear carries input torque all the time you are moving forward.
ATF+4, checked hot in Neutral. Confirm the cooler flows freely, since lube loss is a common cause of geartrain damage in these units.
