4L65E Master Rebuild Kit 2004, new and ready to install. Fits the 4L65E. Ships fast from the USA.
By now most 2004 GM trucks with the 4L65E have well over 150,000 miles, and plenty of them spent those miles pulling a boat or camper. If your 2004 Silverado, Sierra, Tahoe, Yukon, Suburban or Avalanche with the 5.3L or 6.0L now slips into 3rd, drops out of 4th on a grade, or smells hot after a tow, this kit is sized for the 2004 model year. The photo shows the full overhaul spread: friction plates, steel plates, a 2-4 band, the filter, a cork pan gasket, valve body and case gaskets, front and rear seals, sealing rings and O-rings.
The 4L65E is GM's heavy-duty member of the 4L60E family, coded M32 on the glovebox parts sticker. It shares the basic layout of the lighter unit but was paired with the higher-torque V8s, which is why its weak point is heat in the clutch packs when a truck works hard. The 3-4 clutch takes the most abuse: it applies on the 2-3 shift and stays applied in 4th, so any loss of pressure there shows up as slip at highway speed under load. This kit replaces the lining on every pack, the steels they clamp against, the 2-4 band and the seals that hold the apply pressure, so the 2004 unit goes back together with no worn soft parts left inside.
Burnt 3-4 clutches are a result, not always the cause. Sonnax lists a worn pressure regulator valve as a source of low line pressure, with readings 50 to 100 psi under spec in Reverse and symptoms that include clutch slip, reverse chatter and 3-4 clutch failure. Hook up a pressure gauge before teardown so you know whether the pump and valve body need attention along with the clutches. Our Silverado 1500 4L65E shift problems guide covers the road-test checks, and the 4L65E pump failure guide explains how a tired pump starves the clutches.
This listing is for 2004 4L65E units. Kits for this transmission family are usually split at 2004, and a 2004 truck takes the later-style set, so do not use it on a 2001-2003 unit. Confirm M32 on the glovebox sticker; a 2004 truck with code M30 has the 4L60E instead, and gas 2500 HD and 3500 trucks with the 4L80E need a different kit entirely. Lay each gasket over the case, pump and valve body and match the holes before installing. If anything does not line up or you want us to check, send the year and VIN. The full range of parts for this unit is on the 4L65E collection page.
| Fits | 4L65E 2004 |
| Part type | Master Rebuild Kit |
| Condition | New |
| 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.
No. This kit is for the 2004 model year. A 2001-2003 unit needs an earlier-style kit such as the 1993-2003 master kit.
Usually not. Most gas 2500 HD and 3500 trucks used the 4L80E. Check the glovebox sticker: M32 is the 4L65E, M30 is the 4L60E, and the 4L80E has its own code.
Inspect the input drum, sun shell, reaction shell and rear planetary for wear, and check the pump and pressure regulator valve. Replace solenoids too if they are original.
Usually low line pressure or a leak in the 3rd gear oil circuit, often made worse by towing heat. Find that cause during the rebuild or the new clutches can fail the same way.
Dexron VI is the current GM fluid and is backward compatible with the original Dexron III fill. Use it for the refill and set the level hot.
