4L85E Pump, used and ready to install. Fits the 4L85E. Ships fast from the USA.
This is a used OEM 4L85E pump assembly for buyers who want factory GM hardware at a lower price than a remanufactured unit. As pictured, it is the complete pump with the stator shaft in the cover. It suits a heavy-duty Chevrolet or GMC pickup or van with a 4L85E that has lost pressure: soft or late engagement, slipping in every gear, or a whine that rises with engine rpm.
The 4L85E is GM's heavy-duty four-speed, built on the 4L80E case with five-pinion planetaries. The pump at the front of the case is a vane pump driven by the converter hub, and it supplies all of the oil that applies clutches and bands, charges the converter and feeds the cooler. The stator shaft you see in the photo supports the converter stator and carries converter feed and return oil, and the pump cover holds the pressure regulator and boost valve that set line pressure. When the rotor, vanes or slide wear, every circuit downstream loses pressure at once, which is why pump trouble feels like the whole transmission is slipping.
Check fluid level and condition first, then gauge line pressure. Low pressure everywhere is the pump pattern. A buzz with very high pressure, especially in Reverse, is the classic worn boost valve sleeve that lives in the pump bore and is fixed with a valve kit. Slip only in 3rd, 4th and Reverse usually means a worn 3rd/Reverse checkball sleeve in the valve body, and GM bulletin PIP3259J documents a 1st and 2nd gear planetary whine on these trucks that is not a pump at all. Start with our 4L85E pump failure guide, and if the pressure numbers look like a valve problem, read 4L85E valve body problems and testing.
This used pump is listed for the 4L85E without a specific year range, so confirm the match before install. GM built the 4L80E/4L85E pump in three groups, 1991-1996, 1997-2003 and 2004-up, and they are not interchangeable across groups. Compare your old pump side by side: casting, cooler passages and the stator shaft. Better yet, send us your year and VIN and we will tell you whether this unit or a year-specific one such as the 1997-2003 4L85E pump is the right call. Browse every part for your transmission in the 4L85E collection.
| Fits | 4L85E |
| Part type | Pump |
| Condition | Used |
| 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 a used OEM GM pump assembly. If you want a remanufactured unit, the year-specific 1997-2003 and 2004 pumps are remanufactured.
The pump groups are 1991-1996, 1997-2003 and 2004-up. Compare your old pump, or send us the year and VIN and we will match it before shipping.
The two transmissions share the pump design within the same production group, so a matching-year 4L80E pump and 4L85E pump are built the same way.
Dexron VI ATF. Prime the pump with fluid during assembly and check the level hot with the engine running.
If the old pump failed from debris or the pan shows clutch material, yes. A new pump will not fix worn clutches, and the debris will damage the new pump.
