4L80E Clutch Drum 2002, remanufactured and ready to install. Fits the 4L80E. Ships fast from the USA.
This is a remanufactured overrun clutch housing for the later 4L80E, complete with the drum and the overdrive sun gear, built for the blue/green sprag design used from roughly 2000 on and listed for 2002 and later units. Most people searching for it own a 2002 to 2009 Chevy or GMC 2500 or 3500 pickup, a Suburban 2500, or an Express or Savana van that flares or will not pull in Drive, or they have the transmission apart and found a melted overdrive one-way clutch and a scored housing. It is a cleaned and inspected hard part, not a used pull.
The overrun housing sits at the very front of the gear train, right behind the pump, and it is the heart of the overdrive section. It carries the overrun clutch pack, the overdrive sun gear, and the overdrive one-way clutch that rides inside the drum. In the overdrive range that one-way clutch locks the overdrive planetary for 1st, 2nd and 3rd on its own and freewheels when the fourth clutch takes over for overdrive. The overrun clutch only applies in the manual ranges, where it backs up the one-way clutch and gives engine braking. That arrangement is why trucks that tow or plow in the overdrive position wear this assembly out: the one-way clutch carries all of the load by itself.
Drive the truck in Drive and then in manual 3. If it pulls cleanly in manual 3 and slips or will not move in Drive, the overdrive one-way clutch or this housing is the prime suspect. Check fluid level and condition first, and gauge line pressure, since low pressure from worn circuits burns clutches across the whole unit. Our 4L80E common problems guide walks through the overdrive section failure in order, and the Silverado 2500 problems guide covers the heat and towing patterns that lead to it.
This housing is listed for 2002 and later 4L80E transmissions, and the remanufacturer describes it as the 2000-up blue/green sprag version. That covers the late Chevy and GMC 2500 and 3500 pickups, Suburban 2500, Express and Savana vans and late Hummer H1 applications through the end of 4L80E production. The listing references GM 8680918. Earlier 1991 to 2000 units used the black sprag design and need the earlier housing, so look at the sprag in your old unit and match it. If you are not sure which one you have, send us your year and VIN and we will check it. Every part we carry for this unit is on our 4L80E collection page.
| Fits | 4L80E 2002 |
| Part type | Clutch Drum |
| Condition | Remanufactured |
| Brand | GM |
| 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 built for the later blue/green sprag design listed for 2002 and later. A 1998 unit normally uses the earlier black sprag style, so match the sprag in your old housing or send us your year and VIN.
In manual ranges the overrun clutch applies and holds the overdrive planetary. In Drive the one-way clutch in this housing does that job alone, so a failed one-way clutch or worn housing shows up only in Drive.
The listing describes this housing as the blue/green sprag version. If you need to confirm exactly what is in the box before you tear down, contact us and we will verify it.
New overrun clutch frictions and steels, the sealing rings, and the pump bushing if it is worn. Check the overdrive planetary for heat damage too.
Use Dexron VI ATF and set the level with the transmission at normal operating temperature.
