GM factory bell housing and pump cover for the 6L80 and 6L90, replacing a scored stator bore that bleeds off line pressure on a rebuild.
If your 6L80 rebuild stalled because the pump pocket in the bell housing is grooved, or a previous shop already resurfaced it once, this is the part that gets you back on schedule. GM 24248031 is the factory torque converter housing for the 6L80, 6L80E, 6L90 and 6L90E, the casting behind Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro and Corvette six-speeds from 2006 on. It is the right buy for anyone chasing low line pressure, a shaky pressure gauge needle at idle, or delayed engagements that get worse hot after a converter failure.
On most older automatics the pump is a separate assembly that bolts in behind the converter. The 6L80 splits it. The variable-displacement pump rotor and slide ride in a pocket machined straight into this aluminum bell housing, and the stator support closes the other side. The converter hub turns the rotor, so the same casting also carries the hub bushing surface. That means the bell housing is half of the pump: every psi of line pressure, converter feed and lube oil starts in this pocket.
The trouble is that it lives directly downstream of the converter. When converter clutch friction material comes loose, the debris passes through the pump and scores the pocket and the stator face. GM's own guidance on converter friction failures on this family is to check line pressure first, because a scored pump drops pressure and then takes out clutches, with the 4-5-6 pack usually the first casualty.
Put a gauge on the mainline port on the passenger side and compare actual pressure to what the scan tool commands, as covered in our 6L80 pump failure symptoms guide. Once the unit is apart, do not trust a pocket just because it looks clean. Check rotor and slide clearance with Plastigage, since the spec published in GEARS is only 0.0008 to 0.002 inch, too tight for a feeler gauge and straightedge. Look for sanding or wheel marks that tell you someone has already resurfaced it. The 6L80 common problems guide walks through the converter debris failure that usually sends these housings to the scrap pile.
Cutting a scored pocket is common, but every cut has a cost. Material taken off the pocket and the worm track adds to unit endplay, which ATRA puts at 0.004 to 0.006 inch, and GM provides no factory shim to take it back. Cut too deep and the pocket can distort, the slide can bind, and the slide return spring pocket can lose the roughly 0.020 inch clearance it needs. A new GM casting returns every one of those dimensions to factory without shims or guesswork.
This housing fits the 6L80, 6L80E, 6L90 and 6L90E from 2006 up. The 6L90 uses a longer case and a different output shaft, but the front of the unit is shared, which is why one bell housing number covers both. GM changed pump cover sealing rings and other front-end parts over the production run, so compare your old casting to the photos and transfer your own matched stator support. If you are unsure, send us your year and VIN before ordering. Everything else for this unit is on the 6L80 parts page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. GM 24248031 is listed for the 6L80, 6L80E, 6L90 and 6L90E from 2006 up. The 6L90 differs at the rear of the unit, not at the bell housing.
The housing contains the machined pocket the pump rotor and slide run in, but it ships as a bare casting. Reuse or replace your rotor, slide, vanes and stator support after inspecting them.
The line pressure tap bolt, the torque converter inspection covers and the vent tube are not included and come off your original housing.
You can, but each cut adds endplay that GM gives no shim to correct, and repeated cuts can thin the pocket enough to distort it. A new casting avoids that stack-up.
A new converter seal, pump gasket and O-rings at minimum, and inspect the converter for internal friction debris. Flush the cooler so leftover debris does not return to the new pump pocket.
Dexron VI. The 6L80 has no dipstick, so set the level at operating temperature using the check plug procedure and reset transmission adapts afterward.
