6T40 Sprag Clutch 2014, used and ready to install. Fits the 6T40. Ships fast from the USA.
If a 2014 or newer Malibu, or another GM car with the third-generation 6T40, revs and barely moves from a stop in Drive but pulls fine in manual first and reverse, the low one-way clutch is the part to look at. This listing is a used original GM Gen 3 low/reverse mechanical diode, part number 24274199, pulled for 2014-up units with engine start/stop. It is the lighter redesigned diode, not the earlier steel-race version.
Parts catalogs call it a sprag, but the 6T40 has used a mechanical diode for its low one-way clutch from the start: spring-loaded struts in one plate catch notches in the other in one direction and ratchet past them in the other. In Drive first the diode holds the reaction member while the 1-2-3-4 clutch applies, so first gear needs no low/reverse clutch at all. When the TEHCM applies the 2-6 clutch for second, the diode simply overruns. In manual first and reverse the low/reverse clutch is applied hydraulically and does the holding instead. For Gen 3, GM redesigned the diode to cut rotating inertia: the splined inner race looks more like aluminum than steel and has a step cut into its inside diameter, and the pocket plate carries scallops that reduce spin loss. Those details are how you tell this part from the Gen 2 piece.
Road test Drive against manual first. A car that will not launch in Drive but drives away normally in manual first is the classic diode pattern. Check the fluid first; a low unit slips everywhere, and Gen 3 units also see pump and pressure regulator wear that burns every clutch and feels like a general slip in forward and reverse, which is not a diode problem. Scan for codes: a no-first complaint with P2723 or P0878 points at the 1-2-3-4 circuit or a pressure control solenoid, not a mechanical one-way clutch. Our 6T40 shift solenoid guide walks through those, and the 6T40 common problems guide covers the cracked 1-2-3-4 piston and the level check.
This diode is listed for 2014 and later 6T40 units with start/stop, GM part 24274199. Gen 3 did not arrive in every model at the same time: a 2014 Malibu MNH was one of the first applications, while a 2015 Cruze may still carry the Gen 2 transmission, so the model year alone will not tell you which diode you have. Pull your old part and compare it with the photo; the Gen 2 diode, 24274198, has a steel inner race with no step. If yours is the Gen 2 style, see our new 24274198 6T40 low clutch sprag, or compare the 2013 Malibu 2.5L diode. Not sure? Send us your year and VIN and we will check it.
| Fits | 6T40 2014 |
| Part type | Sprag Clutch |
| Condition | Used |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Possibly not. 24274199 is the Gen 3 part. Gen 2 units use 24274198, and some 2014-2015 vehicles still have Gen 2 transmissions. Compare your old diode with the photo or send us your VIN.
If Drive will not launch but manual first and reverse work normally, the diode is the likely cause. Slipping in every gear points to fluid level, pressure or burnt clutches instead.
No. It is a used original GM part listed for 2014-up 6T40 units with start/stop, covered by our 1-year warranty.
Replace the bonded low/reverse and 1-2-3-4 pistons, the filter, and any race or plate the old diode damaged. Flush the cooler if it shed metal.
Dexron VI, level set hot at the check plug. Clear the adaptive values and drive through light-throttle shifts so the TEHCM relearns clutch fill.
