6T75 Clutch Drum 2007, new and ready to install. Fits the 6T75. Ships fast from the USA.
A first-year 6T75 that suddenly drops 3rd, 5th and Reverse is usually telling you the same story: the 3-5-Reverse wave plate broke and took the housing splines with it. This page covers a new 6T75 clutch drum listed for 2007, the input-shaft drum that carries two clutch packs, for anyone rebuilding an early heavy-duty 6T75 who needs a clean housing instead of a damaged one. The listing carries reference number D25550B, which is useful when you compare it against your old part.
In GM's exploded view this part is item 422, the 3-5-Reverse and 4-5-6 Clutch Housing Assembly. It is the only rotating clutch housing in the unit. The input shaft is built into it, so it turns at turbine speed any time the converter is driving. Inside sit two pistons: the 3-5-R piston on one side and the 4-5-6 piston on the other, each with inner, outer and dam seals and its own return spring. Oil for both pistons feeds through sealing rings riding on the case cover hub. The input speed sensor reluctor wheel clips to the outside of the housing, so the TCM's input speed signal comes straight off this drum. GM's drive-range descriptions show the 3-5-R clutch applying in third and releasing on the 3-4 upshift while the 4-5-6 clutch applies, which means both halves of this drum work on almost every upshift above second gear.
Scan for codes and note exactly which gears are gone. P0776 plus a clean loss of 3rd, 5th and Reverse is the wave plate pattern; a 2-3 or 3-4 shudder with no hard codes is more often a valve body problem, which our 6T70 3-4 clutch failure guide walks through. Once the unit is apart, look at the inside splines where the wave plate teeth sit. Sonnax found the OE plate tends to crack at a tooth corner and usually damages those splines as it comes apart, which is why a new plate dropped into an old drum often comes back. Check the ring lands on the hub for grooves and spin the housing on the case cover to feel the bushings. The broader list of 6T75 complaints is in our 6T70 and 6T75 common problems guide.
This listing is for 6T75 units dated 2007. The 6T75 is the higher-torque version of the 6T70 family, and early 2007-2009 units are the ones Sonnax and GM both single out for wave plate failures. GM revised internal parts across the run, so the model year alone is not proof of fit. Lay your old housing next to the photo and match shaft length, spline count and the reluctor wheel, and check the reference number and the RPO code on the Service Parts ID label. If you are unsure, send us your year and VIN before you order. A 6T70 drum is a different listing; 6T75 owners can see everything else for this family on the 6T70/6T75 parts page.
| Fits | 6T75 2007 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | OEM |
| Reference | D25550B |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. On the 6T70/6T75 the input shaft is part of the 3-5-Reverse and 4-5-6 clutch housing assembly, and the product photo shows the shaft installed in the drum.
It is the reference number carried on this listing. Use it, together with the photo and your old part, to confirm a match. If your old housing carries a different number, send it to us with your year and VIN before ordering.
Not always, but often. When the plate breaks it usually chews the drum splines it rides in. Light burrs can sometimes be cleaned up, but notched or flattened splines will break the next plate, so a new housing is the safer repair.
Do not assume so. The two share a layout, but the 6T75 is built for higher torque and parts differ by version. Match your old housing to the photo and part number, or send us your VIN.
New piston seals, sealing rings, a new wave plate and frictions, plus the pump fluid filter, control solenoid filter plate and a fresh filter and pan gasket. Flush the cooler and lines so old debris does not return.
Dexron VI ATF only. After the repair, clear codes and run the transmission adapt reset and relearn with a scan tool so the TCM learns the new clutch packs.
