6L90 Clutch Drum 2007, used and ready to install. Fits the 6L90. Ships fast from the USA.
No Reverse, a Reverse that takes seconds to engage, a slip in fifth, or a harsh 2-3 and 4-5 shift on a 2007 or later Silverado or Sierra 2500HD/3500HD, Express or Savana are the classic signs of a cracked 1-2-3-4 / 3-5-Reverse clutch drum in the 6L90. This is a used original GM drum for 2007-up 6L90 units, supplied as a complete drum with its steels and clutches installed, so you are swapping a known-good housing instead of welding or patching a cracked one.
The 6L90 stacks two clutch packs in one housing. The inner 1-2-3-4 clutch is applied in first through fourth gear, and the outer 3-5-Reverse clutch is applied in third, fifth and Reverse. Apply oil for both packs is fed through the stator support and sealing rings into the drum, and each pack has its own piston. Because the housing is a welded assembly, the weld seam is the weak point: when it cracks, apply oil leaks out under load, the 3-5-R pack loses holding power first, and the shift complaints follow.
GM's service bulletin on this failure describes a bench test: with the drum out, seal the feed holes, apply shop air and brush soapy water over the weld seam. Bubbles at the weld mean the housing is cracked and must be replaced; new frictions alone will burn up again. With the unit still in the vehicle, rule out the 3-5-R regulator valve in the valve body and a mis-indexed snap ring, both of which Sonnax documents as causes of the same no-Reverse complaint. Our 6L80/6L90 3-5-R clutch failure guide walks through the codes and the air check, and the 6L90 common problems guide covers the other failures that mimic it.
This drum is for 2007 and later 6L90 (RPO MYD) transmissions: Silverado and Sierra 2500HD/3500HD, Express and Savana 2500/3500, 2500-series Suburban and Yukon XL, and the 6L90 performance applications. It is not for the 6L80. ATSG documents that the 6L90 3-5-R clutch hub is 8-1/2 inches against 8 inches in the 6L80, and mixing the two causes a screech on the 2-3 and 4-5 shift after an overhaul. Match your old drum's casting and spline count to this one, or send us your year and VIN before ordering. A 2006 unit has its own 2006 6L90 clutch drum listing, and the rest of the hard parts are on the 6L90 parts page.
| Fits | 6L90 2007 |
| Part type | Clutch Drum |
| Condition | Used |
| 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.
In the 6L90 they are the same housing. This drum carries both the 1-2-3-4 and the 3-5-Reverse clutch packs, and it is supplied with its steels and clutches.
Plug the feed holes, apply shop air and spray soapy water on the weld seam. Bubbles at the weld mean it is cracked. Codes P0776, P2715 or P2723 with no Reverse or a fifth gear slip are the usual warning signs.
It is listed for 2007-up 6L90 units. The 6L80 uses a smaller 3-5-R hub, so do not mix them. For 2006 units use the 2006 listing, or send us your year and VIN to confirm.
Sealing rings on the stator support, the piston seals if you rebuild the packs, the filter, and any frictions that are burnt. Flush the cooler so debris does not return to the new drum.
Yes. Clear the adaptive values and run the adaptive learn so the module relearns fill times for the 1-2-3-4 and 3-5-R clutches.
