6L45 Input Drum 2007, used and ready to install. Fits the 6L45. Ships fast from the USA.
When a Cadillac CTS, an ATS, a V6 Camaro or a BMW with the GA6L45R gearbox loses reverse, slips in the lower gears or comes back from a rebuild with the same complaint, the part most often blamed on the bench is the drum that houses two clutches at once. This is a used original GM drum, reference 45555B, for 2007 and later 6L45 and 6L50 transmissions. It carries the 1-2-3-4 clutch and the 3-5-Reverse clutch and measures 7-3/4 in across the outside. The photos show the housing with its pistons, spring assemblies and snap rings; check the pictures against what you need before ordering.
GM builds the 6L45 and 6L50 from five clutches, and Sonnax's application chart for the family shows two of them sharing this housing. The 1-2-3-4 clutch is on in first, second, third and fourth. The 3-5-Reverse clutch is on in third, fifth and reverse. Each has its own piston in the drum, and apply oil reaches them from the TEHCM through sealing rings on the support. Because the two clutches overlap in third, a leak in the drum shows up in more than one gear: reverse goes soft, the 2-3 shift flares, and the transmission can lose drive in the lower gears once the 1-2-3-4 pack burns.
A code or a slip does not prove the drum is bad. Sonnax's no-movement analysis for this family shows line pressure and solenoid faults that look exactly like a failed clutch. Start with fluid level and condition, read the codes and live data, and work through our 6L45 limp mode diagnosis guide. If the transmission comes apart, air-check both pistons in the assembled drum and look for bubbles at the welds and seal lands. Our 3-5-R clutch failure breakdown explains why this housing fails across the whole six-speed family.
The 45555B drum is listed for 2007-up 6L45 and 6L50 units, and the listing names Chevrolet Camaro, Caprice and Colorado, Cadillac ATS, STS, SRX and CTS, and BMW X1, X3, 1 Series and 3 Series applications. Both transmissions share this design, but an early 2006 drum is a different part; we stock that version as the 2006 6L45 clutch drum. Measure your drum's outside diameter, compare the piston and spline design to the photos, and check the RPO code on the service parts label (MYA for the 6L45, MYB for the 6L50). If you prefer a new housing, the new 2007-up 6L45 drum is the same design. Send your year and VIN if you want us to confirm, and see every part for this unit on the 6L45 parts page.
| Fits | 6L45 2007 |
| Part type | Input Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
It is the drum that houses the 1-2-3-4 and 3-5-Reverse clutches, GM reference 45555B. Some catalogs list it as an input drum and others as the 1-2-3-4 / 3-5-R clutch housing.
The listing names both the 6L45 and 6L50 from 2007 on. Confirm your RPO code (MYA or MYB) and compare the 7-3/4 in outside diameter and the photos to your old drum.
No guarantee. The early drum is a different design. Match your old part to the photos, or send your year and VIN and we will check before you order.
Frictions and steels for both clutch packs, piston seals, sealing rings and any worn bushings. A master rebuild kit covers those parts in one box.
Dexron VI, with the level set hot by the check plug method. Afterward, clear the adapts and complete a relearn so the TCM learns the clutch fill times again.
