4L65E Overhaul Kit 2004, new and ready to install. Fits the 4L65E. Ships fast from the USA.
A 2004 GM truck or SUV with the 4L65E is now past twenty years old, and most of them have the mileage to match. This new overhaul kit is listed specifically for the 2004 model year, the one most buyers mean when they search for a reseal on a 5.3L or 6.0L Silverado, Sierra, Tahoe, Yukon, Suburban or Avalanche of that era. Typical reasons to be here: fluid leaking from the front of the bellhousing, a harsh or late shift into Drive, slipping that started after a hot day of towing, or a unit already on the bench with hard, cracked seals.
The kit is the sealing package for a rebuild: gaskets for the pump, case and valve body, piston lip seals, the shaft and pump stator sealing rings, and the O-rings around the servo, accumulators and electrical connector. On a 2004 unit the pump deserves special attention. The pressure regulator valve in the pump cover sets line pressure for the whole transmission, and Sonnax documents bore wear in that valve on the 4L60-E/4L65-E/4L70-E pump as a cause of erratic line pressure, low pressure rise, pump noise, reverse chatter and 3-4 clutch failure. Fresh seals will not hold a clutch on if the pump cannot make pressure, so treat the overhaul and the pump inspection as one job.
Separate an external leak from an internal failure first. A pan gasket or cooler line leak does not need a teardown. If the truck slips or engages late, check the fluid level hot, pull the pan, and connect a pressure gauge; low or slow-rising line pressure points toward the pump. Our 4L65E pump failure guide explains the pressure regulator and stator bushing wear in detail, and the Silverado 1500 4L65E problems guide covers the faults owners of these trucks report most.
This kit is listed for the 2004 4L65E. It shares most of its design with the rest of the 2004-2013 family, but pump and case details changed over the years, so match your unit against the product photos before you start, or send us the year and VIN for a check. If your truck is a 2003 or earlier, use the 1997-2003 overhaul kit. For a later build or a wider year range, the 4L65E master rebuild kit for 2004-2013 adds clutches and more. Browse the full 4L65E parts catalog for everything else.
| Fits | 4L65E 2004 |
| Part type | Overhaul Kit |
| 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.
It is listed for the 2004 4L65E. Much of the design carried forward, but confirm against your unit or send us your year and VIN. For a wider range, look at the 2004-2013 overhaul kit.
Not always. A front pump seal leak can be fixed with the transmission pulled and the seal replaced. A full overhaul makes sense when the leak comes with slipping, late engagement or burnt fluid.
Inspect it first. Worn pressure regulator bores, a loose stator bushing or scored gears are reasons to rebuild or replace it, because low line pressure will burn new clutches.
Check the product photos for the exact contents. Overhaul kits center on gaskets and seals; if friction plates are not shown, add them or choose a master rebuild kit.
Dexron VI ATF. It replaced the earlier Dexron fills as GM's service fluid and is backward compatible, so it is correct for a 2004 unit.
