6T45 Sprag Clutch 2008, remanufactured and ready to install. Fits the 6T45. Ships fast from the USA.
The 6T45 is the heavier-duty member of GM's 6T40 family, built for bigger front-drive cars and crossovers, and a first-generation 2008 unit with high mileage can lose its low one-way clutch long before the rest of the gear train gives up. If your 6T45 bogs on launch, slips out of a stop or only pulls cleanly after the first upshift, this remanufactured GM sprag clutch listed for 2008 units is built to put first gear back. The listing carries reference 24274198.
Every forward gear in a 6T45 uses two holding devices. First gear in Drive pairs the applied 1-2-3-4 clutch with the mechanical one-way clutch, which locks to hold the reaction member. Once the 2-6 clutch applies for second, the sprag overruns and stays out of the way through sixth. Because the 6T45 handles more torque than a 6T40, the launch load on this one-way clutch is higher, and a worn unit tends to slip hardest on hard takeoffs and uphill starts. In manual first and reverse, the hydraulic low/reverse clutch holds instead, which is the key to diagnosing it.
Start with fluid level and condition at the check plug with the fluid hot, because an underfilled 6T45 slips on launch too. Next, scan the TEHCM. Codes such as P0776, P2723 or P0878 send you toward the clutch circuits, solenoids or the 3-5-R wave plate, which are the well-documented 6T40/6T45 failures in our common problems guide. If the scan is clean and the vehicle drives away normally in manual first while Drive first slips, the one-way clutch is the likely cause. For a closer look at the control side, the valve body symptoms guide lays out what a hydraulic fault feels like by comparison.
This sprag clutch is listed for the 2008 6T45, a Gen 1 transmission. GM moved the family to Gen 2 controls for 2012 and later to Gen 3, and Sonnax notes many parts do not cross between generations, so a 2008 part is not an automatic fit for a later unit. Match the 24274198 reference or the number on your old one-way clutch, compare the spline count and diameter with the photo, or send us your year and VIN to check. If you need a part with no year limit, see the used OEM 6T45 sprag clutch, and for a wider 2008-2013 application compare the 6T45 sprag clutch for 2008-2013.
| Fits | 6T45 2008 |
| Part type | Sprag Clutch |
| Condition | Remanufactured |
| Brand | GM |
| Reference | 24274198 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
In manual first the low/reverse clutch holds the gearset hydraulically. In Drive first only the one-way clutch holds, so if it freewheels both ways Drive first is lost while manual first still works.
Do not assume so. The 6T45 changed between Gen 1, Gen 2 and Gen 3. Compare the 24274198 reference and the part itself, or send us your year and VIN.
Yes. Solenoid and clutch circuit faults can cause slips and missing gears. A code scan and a manual-first road test help separate the two.
Yes, it is a remanufactured GM sprag clutch listed for 2008 6T45 units.
Fill with Dexron VI, set the level hot at the check plug, clear the adapts and drive through several gentle shift cycles.
