6L80 Sprag Clutch, new and ready to install. Fits the 6L80. Ships fast from the USA.
If your Silverado, Tahoe, Sierra, Yukon or Escalade pulls away from a stop and then feels like it falls into neutral a moment later, or you are mid-rebuild and found worn elements or a pitted race, this is the part you are looking for. It is a new BorgWarner low/reverse sprag assembly for 2006 and later GM 6L80 and 6L90 automatics, cross-referenced to GM 24240618 and 24236388, BorgWarner 140747BW.
The 6L80 is a clutch-to-clutch six-speed with no bands, and first gear is the one range that leans on a one-way clutch. On a launch in first, the low sprag holds the output carrier still while the 1-2-3-4 clutch drives. GM also applies the low/reverse clutch briefly to help the sprag at takeoff, then releases it at about 2 mph. From that point the sprag carries the load by itself until the 1-2 shift, when it simply overruns. Reverse uses the 3-5-R and low/reverse clutches, so the sprag is not what holds you in Reverse.
Separate sprag trouble from clutch trouble with the gear chart. If second, third and fourth also slip, the 1-2-3-4 clutch is the problem. If only first slips and it happens just after takeoff, the sprag is the lead suspect. Check fluid level and condition first and log input and output speed on the launch. Once the unit is apart, inspect the sprag elements and both races closely, because a worn sprag is easy to miss on the bench. Our 6L80 common problems and fixes guide walks through this trap alongside the other pattern failures, and the 6L80 pump failure symptoms guide covers the low-pressure slips that can look similar.
This assembly is listed for 2006 and later 6L80 and 6L90 units. That covers the Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Camaro and Corvette applications, but GM revised internal parts more than once over the production run. Match the GM part number on your old assembly to 24240618 or 24236388, or send us your year and VIN and we will check it before it ships. Every 6L80 part we carry is on the 6L80 collection page. Need a lower-cost path? We also list a used 6L80 center support loaded with clutches and sprag.
Before installing, hold the outer race and confirm the assembly freewheels in one direction and locks in the other, matching the old unit. Replace any race that shows pitting or brinelling, and clean all metal out of the case, valve body passages and cooler before reassembly. A sprag that failed usually means the low/reverse and 1-2-3-4 clutches saw extra heat, so most builders install it with a 6L80E master rebuild kit with frictions. Air-check every clutch circuit after assembly. Refill with DEXRON-VI using the GM check plug procedure, then reset adapts and complete a relearn. A fresh 6L80 pan, filter and gasket kit finishes the job.
| Fits | 6L80 |
| Part type | Sprag Clutch |
| Condition | New |
| 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.
A failed 1-2-3-4 clutch slips in first through fourth. A failed low sprag slips only in first, usually right after takeoff when the low/reverse clutch releases at about 2 mph. Second gear and up feel normal.
No. Reverse uses the 3-5-R and low/reverse clutches. If you have no Reverse, look at those clutches and the valve body instead.
New. It is a BorgWarner assembly cross-referenced to GM 24240618 and 24236388.
It is listed for both the 6L80 and 6L90 from 2006 up. Compare the part number on your old assembly or send us your year and VIN to confirm.
Inspect the races and replace them if pitted, and replace the friction plates if they are burned. A full master rebuild kit is the usual pairing.
DEXRON-VI, filled with the GM check plug procedure because the 6L80 has no dipstick. Reset adapts and relearn afterward.
