4L65E Pump, remanufactured and ready to install. Fits the 4L65E. Ships fast from the USA.
If your 5.3L or 6.0L Silverado, Sierra, Tahoe, Suburban, Avalanche or Yukon is slow to pull into Drive, slips on a grade with a trailer behind it, or keeps cooking 3-4 clutches no matter how many times they get replaced, the front pump is the part most worth looking at. This is a remanufactured GM 4L65E pump, rebuilt and ready to bolt in, so a tired pump gets replaced with a known-good assembly instead of a pile of individual repair pieces.
The 4L65E is GM's heavy-duty version of the 4L60E, built for the bigger V8 trucks and rated by Chevrolet Performance at 430 lb-ft. Its front pump is turned directly by the torque converter hub, so it spins any time the engine runs. It does two jobs: it keeps the converter full and it makes line pressure, the hydraulic force that clamps every clutch pack and band. The pressure regulator valve that sets that line pressure rides in a bore machined into the aluminum pump cover, and the PCM moves it up and down all day through the pressure control solenoid. Because the 4L65E sends more torque through clutch packs that are close in size to a 4L60E's, it has very little margin when that circuit starts leaking.
Put a mechanical gauge on the line pressure tap and compare readings in Reverse and Drive, at idle and under load, against your factory spec. A reading that falls short under load points at the pump. Then look at what kind of pump problem it is. Most worn 4L65E pumps still turn and still move fluid; they just leak pressure past a worn regulator bore. A pump that produces nothing at all is a mechanical failure such as a broken rotor or a converter that is not engaged in the drive slot. Our 4L65E pump failure symptoms guide walks through both cases, and the 4L65E common problems guide covers the valve body wear that can mimic a weak pump. If the gauge reads normal, look at the valve body before buying a pump.
This listing covers the 4L65E, the RPO M32 transmission that GM installed behind the 5.3L and 6.0L V8 in 2001-2007 Chevrolet and GMC full-size trucks and SUVs. The listing does not name a single model year, and GM revised this pump more than once, so match it before you install it. Compare the cover and boost sleeve against the pump you remove (early covers use a long boost sleeve, later ones a short sleeve, and they do not interchange), and note whether your transmission has an input speed sensor, which arrived around 2006-2007. If you are not sure, send us your year and VIN and we will confirm the right one. For a specific range, see our 2004 4L65E pump and 2006 4L65E pump, or browse every part on the 4L65E collection page.
If the 3-4 clutches are already burnt, replacing only the pump leaves the job half done. A 4L65E Banner rebuild kit supplies the frictions and seals, and a remanufactured valve body handles worn regulator bores on the other side of the hydraulic circuit.
| Fits | 4L65E |
| Part type | Pump |
| Condition | Remanufactured |
| 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.
Probably, if it has the 4L65E (RPO M32 on the glovebox sticker). GM changed the pump during production, so compare the boost sleeve and cover against your old pump, or send us your year and VIN to confirm before ordering.
Yes. Low line pressure is the most common root cause of 3-4 clutch failure in this transmission family. If you replace the clutches and leave a pump that bleeds off pressure, the new clutches usually fail the same way.
Yes. The front pump sits behind the torque converter, so the transmission has to come out of the truck and the converter has to come off to get to it.
Dexron VI ATF. Pre-fill the converter, flush the cooler and lines, then set the level hot with the engine running in Park.
Inspect it first. A scored hub, a converter full of debris, or one that has overheated should be replaced, because it feeds directly into the new pump. A clean converter with a smooth hub can usually go back in.
