6L90 Pump 2006

Some 6L90 teardowns end at the bell housing. The converter let go and sent metal through the pump, the bushing bore wallowed out, a bolt boss cracked, or the pump pocket is scored too deep to clean up. When that happens on a heavy-duty Silverado or Sierra, an Express or Savana van or a Camaro ZL1, a new pump body is the clean way out. This listing is a new aluminum bell housing pump body for the 6L90, referenced to GM 24248031. The photo shows the front of the casting with the pump pocket, the converter hub bore and the cast oil passages.

What the pump body does in a 6L90

GM built the 6L-series pump into the bell housing. The rotor, slide and vanes sit in a pocket machined into this casting, the converter hub drives the rotor through the bushing bore, and the pump cover bolts over the pocket to close it. That makes this housing two parts in one: the structural link between engine and transmission, and half of the oil pump. The depth and flatness of the pocket set how tightly the pump seals, the bushing bore keeps the converter hub centered, and the filter pickup bore holds the sump filter neck. When any of those surfaces wears, the pump leaks internally and line pressure falls in every gear.

Symptoms that point to the housing

• Low line pressure in all ranges that comes right back after a new pump cover or valve body
• A front seal that keeps leaking because a worn bushing bore lets the converter hub wobble
• Pump whine that climbs with engine speed, often with a spun or worn bushing
• Falling out of gear at a stop with the filter found loose or lying in the pan
• Visible damage after teardown: scored pocket, cracked mounting ears, stripped bolt holes from a converter that came loose

How to confirm it before you buy

A pump body is a teardown diagnosis. Line pressure testing tells you the supply side is weak; the housing gets condemned once the pump is out and you can see the pocket and bore. Check pocket depth against the rotor and slide, look for scoring you can catch with a fingernail, and measure the bushing bore. The 6L90 pump failure guide covers the pressure tests that come first, and the 6L90 valve body testing guide helps rule out a hydraulic control fault that can look the same from the driver's seat.

Fitment

The listing names the 6L90 and the year 2006, with GM reference 24248031. Read the 2006 as the start of the 6L-series casting family rather than the year of your truck: 6L-series production started with the 2006 model year, and the 6L90 reached heavy-duty pickups and vans for 2007. Bell housings differ by engine family and bolt pattern, so lay your old housing next to the photo and compare the casting number, engine bolt pattern, starter mount and converter bore before ordering. If you are not sure, send us your year, engine and VIN. Everything we stock for this transmission is on the 6L90 parts page.

Install notes

• Check the filter pickup bore before anything else. A trade report documented new GM 6L80/90 pump assemblies that were missing the machined step for the filter neck, which let the new filter fall out and caused low pressure. Make sure the step is there.
• Install a new pump bushing and front seal, then transfer or replace the rotor, slide, vanes and slide spring. Many builders put a new rotating group in at this point with our 6L90 pump rotor and slide kit.
• Use new O-rings and gaskets, align the pump cover to the housing and torque the bolts evenly in sequence.
• Replace the sump filter and its seal; GM now supplies them separately.
• If a converter failure started this, replace the converter, flush or replace the cooler and inspect the valve body for debris.
• Fill with Dexron VI, set the level hot, reset adapts and drive the relearn.

A housing job is usually a full rebuild, so it pairs naturally with a 6L90 Banner rebuild kit for 2006-17 units to cover the seals, gaskets and frictions in one order.

Is this a complete pump?

No. It is the bell housing pump body, the aluminum casting that holds the pump pocket. The rotor, slide, vanes and pump cover are separate. Move over good parts from your old pump or add a rotor and slide kit and a pump cover.

My truck is a 2012. Why does the title say 2006?

The 2006 marks where this casting family starts, not a single model year. Fitment depends on engine family and bolt pattern, so compare your casting number and bolt pattern or send us your year, engine and VIN.

Can I reuse my old pump bushing?

It is not worth the risk. A worn bushing is a common reason the old housing failed. Press in a new bushing and install a new front seal so the converter hub runs true.

What should I check on the new housing before installing it?

Confirm the filter pickup bore has its machined step so the filter neck fits snug, check that the pump pocket is clean and free of shipping residue, and chase any threads you will be using.

What fluid and procedure after installation?

Fill with Dexron VI ATF, set the level hot with the engine running, then reset transmission adapts with a scan tool and complete the relearn drive.

• 6L90 Pump Failure Symptoms and Replacement
• 6L90 Valve Body Problems: Symptoms, How to Test, and Replacement
• 6L90 Common Problems and Fixes: Six Failures That Actually Show Up
• 6L90 Silverado 2500 Common Problems and Fixes