6L50 Clutch Drum 2007, new and ready to install. Fits the 6L50. Ships fast from the USA.
If your 6L50 drives forward but will not back up, bangs into reverse after a long delay, or slides through the shift into fifth on the highway, the part to look at is the drum that houses the 3-5-Reverse and 1-2-3-4 clutches. This is a new replacement for that drum on the 2007 and later GM 6L50, reference D45555B, cross-referenced to GM 24260890 and industry D135733A. The listing gives a 7-3/4 in outside diameter. You get the bare drum; the clutches, steels and seals that go in it are bought separately.
The 6L50 (RPO MYB) is the uprated version of the 6L45, sized for more torque while keeping the same five-clutch, six-speed layout. That shared layout means the clutch logic is identical: the 3-5-R clutch holds in third, fifth and reverse, and the 1-2-3-4 clutch holds in the first four gears. Both packs are applied by oil routed from the TEHCM through rotating seals into this drum, and each piston rides in its own bore inside it. The drum has to hold full apply pressure every time the transmission shifts into those ranges. Once a weld cracks, a bore wears, or the sealing ring lands score, the pack sees less pressure than commanded, slips, overheats and starts shedding material into the fluid.
Rule out the cheap causes first. A sticking clutch regulator valve or a bore plug leaking at its retainer in the TEHCM can mimic a failed 3-5-R drum and set the same codes on clean fluid. Our 6L45/6L50 limp mode guide covers the pressure and solenoid checks. If the fluid is burnt and debris is present, pull the unit. On the bench, air the 3-5-R feed with the drum assembled and soapy water on the welds; any bubbling means replace the drum. The 3-5-R clutch failure guide shows the test step by step, and our 6L50 fluid type and capacity guide covers the refill.
The listing covers 2007-up 6L50 transmissions. The 6L45 and 6L50 share this drum reference, so a 6L45 owner may find the same part listed under that model. Earlier units and later revisions are not guaranteed to match: we also stock a 2012 6L50 clutch drum and a 2014 6L50 clutch drum, so compare outside diameter, piston bore design and snap ring grooves against your original. Confirm MYB on the glovebox or trunk RPO label, and if anything is unclear send the year and VIN before you buy. All our parts for this family are on the 6L45/6L50 parts page.
| Fits | 6L50 2007 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | OEM |
| Reference | D45555B |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
This listing's reference, D45555B, is catalogued for both the 6L45 and 6L50 from 2007 on. The two units share the same clutch layout. Still compare your original drum's OD and design before installing.
The 3-5-R clutch covers third, fifth and reverse; the 1-2-3-4 clutch covers first through fourth. Loss of reverse and a fifth-gear slip are the most common first signs.
Yes. A sticking clutch regulator valve or leaking bore plug in the TEHCM can set 3-5-R codes and cause no reverse with an intact drum. Clean fluid with a code leans toward the valve body.
Frictions and steels for both packs, piston seals, sealing rings, and any worn bushings. Flushing the cooler is important so debris from the old pack does not come back.
Yes. Fill with Dexron VI, set the level hot, then reset the adaptive values with a scan tool and drive the relearn procedure.
