Factory GM 24238004 4-5-6 clutch hub with output carrier shaft and dampener for the 6L80, the fix when the welded hub-to-shaft joint lets go.
If your Silverado, Sierra, Tahoe, Yukon, Escalade or Camaro with the 6L80 suddenly pulls away fine in 1st through 3rd but flares, slips or drops out of gear the moment it should go into 4th, the 4-5-6 clutch hub is high on the suspect list. This is the genuine GM 24238004 assembly: the 4-5-6 clutch hub, its long shaft and the factory dampener, sold as one OE replacement for a rebuild that is keeping the stock 36-tooth clutch pack.
The 6L80 builds its six ratios from five clutches, and the 4-5-6 clutch is applied in every gear from 4th up. Its frictions ride on the splines of this hub, and the hub hands that torque down a long shaft to the gearset behind it. GM makes the part as two pieces, a hub welded to the shaft, with a dampener on the hub. Under repeated hard 3-4 shifts, towing or added power, that weld is where the assembly gives up. Sonnax, which builds a forged one-piece replacement for this exact OE number, lists broken 4-5-6 hubs and sheared rear splines as the failures it was designed around.
Rule out the cheap causes first. Check the fluid level hot at the check plug and look for a valve body or solenoid fault code, since a 4-5-6 clutch that is not getting pressure acts the same as one that is not getting held. Our 6L80 slipping under load guide walks through that order. Once the unit is apart, the hub tells on itself: hold the shaft and try to twist the hub. Any rotational play, a visible crack along the weld seam, or splines that are stepped or rounded where the frictions ride means the assembly is finished. Also check the shaft splines at the rear end where it engages the gearset. For the bigger picture on how this failure fits with the other weak spots, see 6L80 common problems and fixes.
This assembly is listed for the GM 6L80 six-speed automatic, the transmission behind 2006-2020 Silverado and Sierra pickups, Tahoe, Suburban, Yukon and Escalade SUVs, and the Camaro. The listing does not break fitment down by year, so confirm GM 24238004 against your VIN in the GM parts catalog, or send us your year and VIN before you order. It is not the part for the longer 6L90, which uses different internals. Browse the rest of our 6L80 parts if you are matching other pieces for the same build.
The hub goes in during a full teardown with the 4-5-6 clutch housing out of the case. Before you set the old one aside, remove the thrust bearing race from its shaft; it carries over to the new assembly, and Sonnax's instructions for the same OE number specifically call out prying that race off and transferring it. Replace the hub thrust bearing if it shows any roughness, and inspect the mating splines on the planetary side, because a hub that let go usually marked up its neighbors. This hub takes the OE 36-tooth frictions and steels, so a fresh set from a 6L80E master rebuild kit and a 6L80 steel clutch plate kit are the natural partners. Set 4-5-6 clutch clearance to spec, refill with Dexron VI, and reset the transmission adapts before the first road test so the TCM relearns the 3-4 shift on the new parts.
| Part number | GM 24238004 (ACDelco) |
| Fits | GM 6L80 six-speed automatic (confirm by VIN) |
| Type | 4-5-6 clutch hub with output carrier shaft and dampener, OE replacement |
| Finish | Machined |
| Item weight | 3.38 lb |
| Package dimensions | 14.75 x 5.25 x 5.25 in |
| Country of origin | United States |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It will if the hub weld or splines are what failed. The same symptom can come from a burned 4-5-6 clutch pack, a leaking piston seal or a valve body problem, so inspect the hub for play and cracks during teardown before assuming it is the cause.
It is listed as GM part number 24238004, the OE 4-5-6 clutch hub with shaft and dampener supplied through ACDelco. It keeps the factory two-piece design, so it suits a stock rebuild rather than a high-power build.
No. The 6L90 uses a longer case and different internals. This listing is for the 6L80 only; confirm the number against your VIN.
Plan on new 4-5-6 frictions and steels, the hub thrust bearing if it is rough, and a full seal and gasket set, which is why most buyers pair it with a master rebuild kit. Transfer the thrust bearing race from the old shaft.
Refill with Dexron VI and set the level hot at the check plug. Reset the transmission adapts with a scan tool and drive it through every shift so the TCM learns the new clutch fill times.
