66RFE Clutch Drum, used and ready to install. Fits the 66RFE. Ships fast from the USA.
A Ram that has Drive but no Reverse, bangs into gear from Park, or slips on launch from a stop often has a burned low/reverse clutch, and this drum is where that clutch lives. It is a used OEM low/reverse drum for the 66RFE and 68RFE, the 7-clutch style with 24 lugs and two bushings, carrying OE reference 52119566AA. It suits HEMI gas Ram 2500 and 3500 trucks with the 66RFE as well as 6.7L Cummins trucks with the 68RFE.
The low/reverse (L/R) clutch is one of three holding clutches in the RFE design, and ATSG describes it as single-sided. It is busier than its name suggests. In Park and Neutral it is the only clutch applied. In Reverse it works with the reverse clutch, and our own testing guides note that combination is the only way the transmission makes Reverse. In Drive first gear it applies with underdrive at a stop, but only while output shaft speed is below about 150 rpm; once the truck is rolling, the low sprag takes over and holds first gear on its own. That means the L/R pack takes a hit every time you shift into gear and every time you back up a trailer. This drum holds the L/R frictions and steels, and its two bushings keep it centered as it turns against the case-side components.
A burned L/R clutch is usually a symptom of oil being lost, not the root cause. Sonnax traces many cases to wear in the low/reverse switch valve bore: the valve is side-loaded, the bore wears, and apply oil leaks past it, which shows up as delayed or no Reverse and delayed 1st and 2nd. Vacuum test that bore with the valve body on the bench; Sonnax treats 18 in-Hg as passing. Our 66RFE no Reverse guide gives the full test order, and the 66RFE delayed engagement guide covers slow engagement into Drive. When the unit is apart, check the drum lugs for notching, the bushings for wear, and the friction surface for heat checking.
This drum is listed for both the 66RFE and the 68RFE. The 66RFE went into 2012-2018 Ram 2500, Power Wagon and 3500 chassis cab trucks with gas engines, and the 68RFE went into Ram 2500 and 3500 Cummins pickups from 2007. Because the RFE line had running changes, check the details that matter here: seven clutch plates, 24 lugs, two bushings, and OE number 52119566AA if your old part shows it. Not sure? Send your year and VIN and we will confirm before shipping. Everything else for this unit is on our 66RFE parts page.
| Fits | 66RFE |
| Part type | Clutch Drum |
| 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.
In Park, Neutral and Reverse, and in Drive first gear only while output speed is below about 150 rpm. After that, the low sprag holds first gear.
It can be. Reverse uses the reverse clutch plus the low/reverse clutch, so a burned L/R pack or worn drum will cost you Reverse. Check the low/reverse switch valve bore first, since a leak there is a common cause.
Yes, it is listed for both. Confirm the 7-clutch, 24-lug, two-bushing design or the OE number 52119566AA on your old part, or send us your year and VIN.
New L/R frictions and steels, piston seals, filters and a cooler flush. Inspect the low sprag and repair the low/reverse switch valve bore at the same time.
No, it is a used OEM drum, and it is covered by our 1-year warranty.
