6T30 Clutch Drum, new and ready to install. Fits the 6T30. Ships fast from the USA.
If your GM car with the 6T30 six-speed has lost reverse, flares into third and fifth, or turned up a broken waved plate and chewed-up splines when the pan came off, the part you are shopping for is the 3-5-R and 4-5-6 clutch housing. This is a new replacement housing made to original equipment specifications, interchanging with GM number 24231648 (industry interchange 133550). It is the bare drum: no input shaft, piston, plates or seals come with it.
The 6T30 is the lightest member of GM's 6T30/6T40/6T45/6T50 front-drive family, and every gear it makes comes from applying two clutches at once. This housing carries two of them. The 3-5-R pack applies in third, fifth and reverse, and the 4-5-6 pack applies in fourth, fifth and sixth. Because the drum is driven by the input shaft, it spins whenever the engine is turning the transmission, and both pistons are fed through sealing rings that ride on the shaft and the support. Fifth gear uses both packs in this one housing, so a damaged drum often shows up across several gears instead of just one.
Sonnax found that the factory waved plate breaks at its tooth corners, and the loose pieces damage the drum splines. Once the splines are notched, a new plate will hang up in them, which is when a new housing makes sense.
Start with the fluid level and a code scan, and write down exactly which gears are missing. A low 6T30 can mimic clutch failure. GM's P0776 bulletin has technicians inspect the valve body, pump, 3-5-R housing and 3-5-R piston before replacing the control module, and it states that air testing the 3-5-R clutch through the case feed ports often gives the wrong answer. The only reliable check is to take the unit apart and look. Our 6T40 family common problems guide walks through that order, and the delayed engagement guide helps when the complaint is a slow reverse rather than a missing one.
This listing is for the 6T30 and does not give a year range, and GM changed this housing during production. Our 2013-up 6T30 drum, for example, is a later design with a three-ring support. Before ordering, compare the number on your old housing to 24231648, count the sealing rings on your shaft, and check the spline and lug pattern against the photo. If you cannot read the old number, send us the year and VIN and we will check it. Housings, drums and other hard parts for every transmission we stock are in our hard parts section.
Move the input shaft and pistons from your old drum only after inspecting them: check the shaft journals and ring grooves for wear, and look at the bonded piston lips for cuts or shrinkage. Fit new sealing rings, a new waved plate, and new frictions and steels for both packs, then set each pack's clearance to spec and air check both clutches on the bench, where the test is meaningful. A drum failure sends metal through the whole unit, so clean or replace the cooler (a 6T40 transmission cooler is listed for this family) and inspect the valve body; a worn one can be swapped with the 6T30 valve body for 2010-2019. Fill with Dexron VI, set the level hot at the level set plug, clear the adaptive values and drive it through a full relearn.
| Fits | 6T30 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | OEM |
| Reference | 24231648 |
| Ships | From the USA |
| Warranty | 1-year |
No. It is the bare 3-5-R and 4-5-6 housing. You transfer the shaft and pistons from your old drum, or source them separately if they are damaged, and supply new plates and seals.
It interchanges with GM 24231648, also listed as 133550. Later 6T30 housings use different numbers, so compare it to the number on your old part.
It can be. P0776 with no reverse or a slipping third and fifth points to the 3-5-R clutch. GM says to inspect the valve body, pump, housing and piston before replacing the control module.
Do not. The 3-5-R waved plate is the part that breaks and destroys drums in this family. Install a new or upgraded plate with the new housing.
Dexron VI. Check the level hot, about 185 to 203 F, at the level set plug with the engine idling, then clear adapts so the TCM learns the rebuilt clutches.
