6T40 Sprag Clutch 2013, used and ready to install. Fits the 6T40. Ships fast from the USA.
This used GM sprag diode, the low one-way clutch, came out of a 2013 Chevrolet Malibu 2.5L 6T40 with the unit code 2JJW. It is a budget fix for a 2013-era Malibu that will not pull cleanly from a stop in Drive. You will usually feel a flare, a dead spot or a lurch before it catches, and then the upper gears shift fine. A used OE diode costs a fraction of a new one and still carries a 1-year warranty. If your 6T40 is already apart on the bench, this is the part to check against.
The 2013 Malibu is a split year. GM moved the 6T40 family to Gen 2 controls for 2012, and GM's PI0604C says every 2013 vehicle it covers uses the Gen 2 design. On top of that, GEARS Magazine lists the 2013-2015 Malibu 2.5L as a 6T40 Gen 3 application. Gen 3 was a fuel-economy update. It moved the pump off-axis, added a lube bypass valve, and gave the diode one-way clutch an aluminum pocket plate with scallops to cut spin loss. So a diode out of a 2.5L Malibu may not match one from an earlier Cruze or Equinox, even though they all say 6T40 on the tag.
First gear in Drive is the only gear the 6T40 holds with a one-way device. The Sonnax 6T40 Gen 2 apply chart shows first as the 1-2-3-4 clutch applied plus the low one-way clutch holding. The struts in the pocket plate lock the reaction member so it cannot turn backward. On the 1-2 upshift they ratchet over as the 2-6 clutch applies. Manual low adds the Low and Reverse clutch for engine braking. Reverse uses that same clutch with the 3-5-R clutch. That is why a failed diode costs you Drive first and nothing else.
Set the fluid level hot at the check plug and read codes before tearing in. Then do the Drive versus manual low test from a stop. If it pulls in L1 and slips in D1, the diode is the strongest suspect. If the slip carries through second, third and fourth, the 1-2-3-4 clutch is more likely. These units are known for cracked bonded 1-2-3-4 pistons, and a 6T40/6T45 bonded piston set covers that repair. The 6T40 delayed engagement guide lays out the engagement clutches. The common problems guide covers the piston and wave plate failures that can be mistaken for a bad diode.
This part is from a 2013 Malibu with the 2.5L and 6T40 unit code 2JJW. It is the best match for 2013-2015 Malibu 2.5L transmissions that use the Gen 3 hardware. For other 6T40 vehicles, compare the pocket plate (aluminum on Gen 3) and the part number on your old one, or send us your year and VIN to check. If you would rather have new, we stock the new ACDelco 6T40 one-way clutch. There is also a 2014 6T40 version for later units.
| Fits | 6T40 2013 |
| Part type | Sprag Clutch |
| 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.
GEARS lists the 2013-2015 Malibu 2.5L as a Gen 3 6T40, so this is the closest match for those years. Confirm by comparing the aluminum pocket plate and the number on your old part, or send us your VIN.
Not without checking. Earlier and non-2.5L units may use the earlier pocket plate. Compare your old diode or send your year and VIN and we will tell you which one you need.
It is the transmission unit code from the donor 2013 Malibu 2.5L. If the tag on your case reads the same, you are looking at the same build.
Test from a stop in Drive and in manual low. A bad diode slips only in Drive first and pulls in L. A failed 1-2-3-4 clutch or cracked piston slips in first through fourth.
DEXRON-VI, set hot at the check plug, then clear adapts and run the fast learn so the clutch-to-clutch shifts are relearned.
