4L85E Sprag Clutch 1991, remanufactured and ready to install. Fits the 4L85E. Ships fast from the USA.
Read this before you order: this listing is the direct clutch drum that the intermediate sprag rides on, not a loose sprag element. It is a refurbished 4L80E/4L85E direct drum, bonded piston style, sold without the sprag, with the OE reference 24209311. It is built for 1997-on units and retrofits back to 1991 4L80E transmissions. If your heavy-duty GM truck or van has lost reverse, lost 3rd and 4th, or turned up a cracked or scored drum on teardown, this is the housing you are replacing. If you need the one-way sprag itself, see our separate 4L85E sprag clutch listing.
The 4L80E and the later 4L85E carry TH400-style gearing behind an added overdrive section, and the direct drum sits in the middle of that gear train. It is a clutch housing with two jobs. Inside it, a piston clamps the direct clutch plates. That clutch applies in 3rd, in 4th and in Reverse. Sonnax points out that the drum has two separate apply areas, one fed for Reverse and one fed for 3rd and 4th, so one drum fault can take out a single range or several. Outside it, the low/reverse band clamps the drum surface to hold it for Reverse. The drum hub also acts as the inner race for the intermediate sprag, which is why this housing ships without one. On the 1-2 shift the sprag locks against this hub to give second gear. On the 2-3 shift the direct clutch applies, the drum speeds up and the sprag freewheels.
Oil reaches the drum through sealing rings on the center support. A worn ring land or bore in the drum lets apply oil escape before it reaches the piston. The plates then slip, overheat and burn.
First rule out the valve body and pressure. Sonnax's no-reverse method splits the two circuits. If 3rd and 4th are present, the direct clutch can apply and hold, so a no-reverse fault points at the band, the servo or the reverse feed. If 3rd and 4th are missing too, suspect a leaking checkball, the seal rings or the drum itself. With the valve body off, air-check the direct clutch through the case to prove both feed passages apply and hold. If one fails, pull the drum and center support and check the ring lands, the bore and the piston. Our 4L85E common problems guide covers this test order, and the 3-4 clutch failure guide explains what a burned direct pack looks like.
This drum is listed for the 4L80E/4L85E family as a bonded piston style drum for 1997-on units that retrofits to 1991. GM did not use the 4L85E name until the 2000s. The earliest 4L80E years are the reason this listing shows 1991. Before 1997 the direct clutch used a different piston design, so an early unit may need the matching 1997-on piston and seals when you fit this drum. Compare your drum to the photo and to the 24209311 reference, or send us your year, model and VIN and we will check it before it ships. Our 4L80E vs 4L85E comparison covers what interchanges, and every part we carry for this unit is on the 4L85E collection page.
| Fits | 4L85E 1991 |
| Part type | Sprag Clutch |
| Condition | Remanufactured |
| 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. This is the direct clutch drum only and it ships without the sprag. The drum hub is the inner race the sprag runs on. Reuse a sprag that is in good condition, or order a new one and fit it in the correct direction.
The listing says this drum retrofits to 1991. Early units used a different direct piston, so plan to install the matching 1997-on piston and seals with it. If you are unsure, send us your year and VIN before ordering.
Not usually. If 3rd and 4th work, the direct clutch can apply and hold, so check the low/reverse band, the reverse servo and the reverse feed first. A drum fault is more likely when 3rd, 4th and reverse are all affected, or when an air check through the case fails.
Replace the direct clutch frictions and steels, the piston seals, and the center support sealing rings. Inspect the sprag, the band and the cooler. A burned direct pack leaves debris that will damage the new parts if the cooler is not flushed.
Use Dexron VI. GM specifies it in place of the older Dexron grades, and it is backward-compatible with earlier units.
