47RE Sprag Clutch 1992, used and ready to install. Fits the 47RE. Ships fast from the USA.
A Ram 2500 or 3500 with the 47RE that flares or will not pull away in Drive, yet takes off normally when you pull the shifter down to 1, is pointing straight at the low-reverse overrunning clutch. This listing is the outer race for that roller clutch: a used original-equipment piece of the 14-roller design that the listing dates to 1992 and later A518 and A618 units, referenced as Chrysler number 4471473. Buy it when your old race is cracked, chipped or scored and the rest of the gear train is reusable. Rollers, springs and cage are not part of it.
The main case of a 47RE is a three-speed Simpson geartrain with a low-reverse drum at the rear. In first gear in D and 2, the roller clutch is what stops that drum from turning, so the rear planetary can deliver the low ratio without the rear band being applied. The race on this part is ramped; the smooth inner race is machined on the low-reverse drum hub. When the transmission shifts to second, the drum wants to turn the opposite way, the rollers roll down their ramps, and the clutch simply lets go. No band timing is involved in the 1-2 shift. In manual 1 and in Reverse, the rear band holds the drum instead, which is why manual low still works on a truck whose roller clutch has failed. This holding job is separate from the overdrive unit, which has its own roller clutch at the back of the transmission.
Start with the hot fluid level, because low ATF+4 gives the same takeoff flare. Then use the road-test chart from the service manual. The rear clutch is applied in every forward range and the roller clutch holds in first only, so a slip in first in D and 2 that is gone in manual 1 is the roller clutch. If the slip shows up in any two forward gears, look at the rear clutch instead, and if it only happens in fourth, it is an overdrive unit problem. On the bench, inspect every roller for flats and the race for scoring or broken ramps. Our 47RE Ram 2500 shift problems guide and the broader 47RE common problems guide put this test next to the other failures these trucks see.
The listing calls this a 14-roller outer race for 1992-up A518 and A618 units, which includes the 47RH and 47RE used in Ram 2500 and 3500 trucks with the 5.9L Cummins and the 8.0L V10. Because it is a used factory part, it carries no brand box or packaging; what matters is the match. Count the roller pockets on your old race (there should be 14), compare the outside profile and the bolt pattern of the cam, and check how it locates in your case. When in doubt, send us your year and VIN. Everything else we carry for this unit is on our 47RE parts page.
| Fits | 47RE 1992 |
| Part type | Sprag Clutch |
| Condition | Used |
| Brand | OEM |
| Reference | A518 |
| 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 outer race only. Reuse your roller and spring assembly only if every roller and spring is in good shape; otherwise replace it.
No. This race belongs to the low-reverse roller clutch in the main case. The overdrive unit has its own roller clutch that installs inside the overdrive output shaft.
The classic sign is slip or no drive in first in D and 2 while manual 1 works, because the rear band takes over holding in manual low. Check fluid level hot first.
It is listed for 1992-up A518 and A618 units with the 14-roller design, which covers 47RE trucks. Count the pockets on your old race to confirm, or send us your VIN.
The factory service manual lists the overrunning clutch cam bolts at 13 ft-lb (17 N-m).
