4L65E Pump 2006, used and ready to install. Fits the 4L65E. Ships fast from the USA.
A 2006 Silverado, Sierra, Tahoe, Yukon or Avalanche with the 6.0L that takes a second or two to grab Drive on a warm morning, slips when it is pulling a trailer up a grade, or whines with engine speed is usually telling you the 4L65E is short on line pressure. When the pressure source itself is the problem, the fix is a healthy front pump. This listing is a used GM pump assembly for the 2006 model year 4L65E, ready to bolt into a transmission that is already out of the truck or on the bench for an overhaul.
The 4L65E front pump is turned directly by the torque converter hub, so it spins any time the engine runs. It fills and feeds the converter and produces every psi of line pressure the transmission uses to apply its clutches and band. That pressure is not fixed: a pressure regulator valve riding in a bore in the aluminum pump cover meters it, and the PCM biases it up or down through the pressure control (EPC) solenoid based on throttle and gear. On a 6.0L truck working hard, the 3-4 clutch and the forward clutch need every bit of that pressure to hold, which is why a pump that is only slightly tired shows up sooner on a 2006 4L65E than on a light-duty 4L60E.
The 2006-2007 period is also when GM began adding an input speed sensor (ISS) to this transmission family. That matters for the pump, because on ISS-equipped units the regulator valve cannot be serviced with the transmission still in the truck; the transmission has to come out, which is often the point where replacing the whole pump makes more sense than repairing the cover.
Put a mechanical gauge on the line pressure tap and read it in Park, Drive and Reverse at idle and under load. Sonnax notes that Reverse line pressure falling roughly 50 to 100 psi below specification under load points at a worn pressure regulator bore in the pump cover. Zero pressure is a different story: check that the converter is fully seated with its drive tangs engaged and look for metal in the pan, which points at a broken rotor. Our 4L65E pump failure guide walks through both tests, and the Silverado 4L65E problem guide covers the other faults that mimic low pressure.
This pump is listed for the 2006 4L65E. GM revised the 4L60E/4L65E pump more than once, including a change from a long to a short boost sleeve, and Sonnax warns the transmission will not work properly if the wrong boost sleeve is used. Match the casting number and stator shaft on your old pump to this unit, or send us your year and VIN before ordering and we will confirm it. If your truck is a 2004 build, the 2004 4L65E pump is the closer match. Browse every part for this transmission on the 4L65E collection page.
If the clutches have already been cooked, do the job once: pair the pump with a 4L65E overhaul kit, and refresh the converter clutch circuit with the 2003-2007 TCC solenoid. GM's PIP5340A notes that a harsh 1-2 shift and P0894 or P1870 can follow a converter or transmission replacement on these trucks, so clear adapts and perform a transmission relearn after the install.
| Fits | 4L65E 2006 |
| Part type | Pump |
| Condition | Used |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the 2006 4L65E, which GM used behind the 6.0L in Silverado, Sierra, Tahoe, Yukon and Avalanche models. Match the casting number on your old pump, or send your VIN and we will confirm before it ships.
Yes. The front pump bolts to the front of the case behind the torque converter, so the transmission has to come out. On 2006-2007 units with an input speed sensor even a regulator valve repair requires removal.
Yes. Low line pressure from a worn regulator bore is one of the most common reasons a 4L65E burns its 3-4 clutch again after a rebuild, so check pump pressure before blaming the clutch pack.
Dexron VI ATF. Pre-fill the converter, fill the case, then check the level with the engine running and the fluid at operating temperature.
Clear transmission adapts and run a relearn with a scan tool. GM documented harsh 1-2 shifts and P0894 or P1870 after converter or transmission replacement on these trucks.
