6T30 Clutch Drum 2008, new and ready to install. Fits the 6T30. Ships fast from the USA.
A 6T30 that pulls first, second and third fine but will not take fourth, or flares and slips on every upshift past third, has usually lost the 4-5-6 clutch. When teardown shows notched lugs, broken splines or a cracked drum, the drum itself has to be replaced, and that is what this is: a new, genuine GM 4-5-6 clutch drum, supplied in the GM box under ACDelco GM Original Equipment, listed for 6T30 units from 2008 on. GM's current superseded number for it is 24259852.
The 6T30 is the light-duty member of GM's six-speed front-drive family, sharing its layout with the 6T40 and 6T45 but sized for the smaller engines in cars like the Cruze and Sonic. Every gear is two clutches applied together. The 4-5-6 clutch is on for the top three: with the 1-2-3-4 clutch for fourth, the 3-5-R clutch for fifth and the 2-6 clutch for sixth. This drum carries the steel plates for that pack on its outer lugs and turns with the input. Because it works in every highway gear, any damage that lets the steels shift or the pack bleed off pressure shows up first at cruise.
Pay attention to which gears are gone. A 6T30 that loses reverse, third and fifth together, often with P0776, is a 3-5-R clutch failure, a known weak spot in this family. Losing fourth through sixth while reverse still works points to this drum instead.
Read codes and the history with a scan tool, then check fluid level and condition before anything else, since a low 6T30 starves the high-gear clutches first. Pull the pan and study the magnet. Our 6T40 family common problems guide applies to the 6T30 and walks through GM's inspection order. Rule out the controls too: a sticking solenoid in the TEHCM can mimic a mechanical slip, and the shift solenoid symptoms guide explains how to separate the two. GM's own bulletin warns that air checking clutches through the case feed ports often gives the wrong answer, so confirm the drum on the bench once the unit is apart.
This drum is listed for the 6T30 from 2008 on. GM moved most of this family to Gen 2 controls in 2012, but GM's bulletin shows 2012 Cruze and Sonic 1.8L cars still on Gen 1, so a model year alone does not tell you which internal design you have. Lay the old drum next to the photo and compare lug count, hub shape and height, and check the part number on the drum if it is readable. If the old piece is a one-piece housing that includes the 3-5-R clutch and input shaft, it is a different part. When in doubt, send us your year and VIN. Clutch application by gear is laid out in our 6T40 family gear ratios and specs, and later cars should look at the 2013-up 6T30 input drum.
Inspect the bushing and sealing ring lands, stack the new frictions and steels in factory order, and set the clutch clearance with the snap ring fully seated. Air check the pack on the bench before final assembly. A drum that let go almost always cooked the frictions in other packs too, so a full 6T30 overhaul kit is the sensible companion, and debris means the valve body, cooler and lines need a thorough cleaning. Refill with Dexron VI, set the level hot at the check plug, clear adaptive values and drive it through all six gears so the TCM can relearn.
| Fits | 6T30 2008 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | ACDelco |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It is a new 4-5-6 clutch drum in the GM box, branded ACDelco GM Original Equipment. GM's superseded part number is 24259852.
It is listed for 6T30 transmissions from 2008 on, used in smaller GM front-drive cars such as the Cruze and Sonic. GM changed controls and some internals around 2012, so compare your old drum with the photo or send us your year and VIN.
Losing fourth, fifth and sixth while reverse works points to the 4-5-6 pack. Losing reverse, third and fifth together, usually with P0776, points to the 3-5-R clutch.
New frictions, steels and seals for the 4-5-6 pack at minimum. A drum failure usually overheats other clutches, so most builders install a full overhaul kit and clean the valve body and cooler.
Dexron VI, with the level set hot at the check plug. Then clear the transmission adaptive values with a scan tool and drive through all six gears so the TCM can relearn clutch fill.
