6T40 Sprag Clutch 2008-2013

This part is more than a bare sprag. It is a remanufactured GM low/reverse and 1-2-3-4 clutch housing assembly from a first-generation 6T40, shown in the photo with the low one-way clutch seated in it. If your 2008-2013 Malibu, Cruze, Equinox, Terrain, Sonic or Regal has lost first gear in Drive, slips on takeoff, or came apart with a cracked piston, this housing replaces the whole stationary assembly in one piece. The listing carries GM reference 24252792.

What this housing does in a Gen 1 6T40

The housing is the stationary support that carries the bonded rubber pistons for two clutches: the 1-2-3-4 clutch and the low/reverse brake. The low one-way clutch, which GM builds as a mechanical diode, rides in it. In Drive first, the 1-2-3-4 clutch applies and the diode holds; in second the diode overruns. In manual first and reverse, the low/reverse piston applies its clutch to hold instead. Because three of the parts that make first gear and reverse work live in this one assembly, a worn or damaged housing can cost you first, fourth or reverse depending on which circuit fails.

Symptoms this housing fixes

• No first gear in Drive while manual first works, from a diode that freewheels both ways
• Slip or flare in first through fourth with P2723, the classic cracked 1-2-3-4 piston
• Slipping reverse or manual first from a leaking low/reverse piston
• Ratcheting or clunk when coasting, or diode debris on the magnet

How to confirm the problem first

Gen 1 units are known for electrical faults that feel mechanical. The internal TEHCM pressure switches on early units fail often, and solenoid faults can drop gears and set P0878 or P2723 without any hard part being damaged. Rule those out with our 6T40 shift solenoid guide before you tear down. Then compare Drive with manual first; a diode failure shows up only in Drive first. Our 6T40 common problems guide covers the cracked 1-2-3-4 piston, the level check and the 3-5-R wave plate failure that often travels with it on high-mileage early units.

Fitment

This assembly is listed for first-generation 6T40 transmissions built 2008 through 2013. GM began moving to Gen 2 in 2012, with exceptions, so a 2012 or 2013 car could have either version, and many parts do not interchange between generations. Match the housing and diode in your unit against the photo and the reference number, or send us your year and VIN. The same Gen 1 assembly serves the 6T45 and is also listed as the 6T45 sprag clutch 2008-2013. If you only need the diode, compare the 2008 6T40 sprag. For a Gen 1 unit that needs more than this housing, the 2009-2011 6T40 solenoid kit covers the controls side.

Install notes

• Inspect the piston bores and feed seal surfaces when the old housing comes out; a scored bore is often why a new piston failed again.
• Check the diode by hand: it should lock one way and ratchet freely the other with every strut springing back.
• Pair the housing with new soft parts; the 6T40 rebuild kit for 2008-2011 fits this generation, and the bonded piston set covers the pistons.
• Fill with Dexron VI and set the level hot at the check plug, then clear adapts and drive gentle shift cycles.

Is this just the sprag or the whole housing?

It is the low/reverse and 1-2-3-4 clutch housing assembly, shown with the low one-way clutch in place. If you need to confirm exactly what is in the box before ordering, contact us first.

Will it fit my 2012 or 2013 6T40?

Only if your transmission is still a Gen 1 unit. GM started the Gen 2 change in 2012, so compare your old housing with the photo or send us your VIN.

Does the same part fit a 6T45?

Yes, this Gen 1 housing is used in both the 6T40 and 6T45 and is also listed under the 6T45.

My car sets P2723. Will this fix it?

P2723 often comes from a cracked 1-2-3-4 piston, which lives in this housing, but a solenoid fault can set it too. Test the solenoids and pressure switches before you replace hard parts.

What fluid does it use?

Dexron VI. Set the level hot at the check plug after install and clear the adaptive values.

• 6T40 Common Problems and Fixes
• 6T40 Shift Solenoid Symptoms and Replacement
• 6T40 Delayed Engagement: Causes and Fix
• 6T40 Valve Body Symptoms: What Wears, What It Does to the Drive, and How to Test It