GM / Chevy 4L60E Remanufactured Pump Assembly 300mm (04–06, No O-Ring / ISS)
The GM/Chevy 4L60E remanufactured pump assembly (300mm, no O-ring or ISS) is an essential component for vehicles equipped with the 4L60E 4-speed automatic transmission from 2004 through 2006. This pump assembly maintains hydraulic pressure throughout the transmission, ensuring proper clutch engagement, smooth gear shifts, and consistent torque transfer. Its precision remanufactured construction delivers reliable performance and durability, making it ideal for trucks, SUVs, and passenger cars operating under normal or heavy-duty conditions.
Over time, worn pump gears, leaks, or reduced hydraulic efficiency can cause slipping, delayed engagement, harsh shifting, or transmission fault codes. Replacing the 4L60E pump assembly restores proper hydraulic pressure and improves overall shift quality, protecting clutches, planetary gear sets, and other critical internal transmission components. Installing a remanufactured pump during a rebuild ensures reliable operation, extended transmission life, and optimal performance.
This 300mm 4L60E reman pump assembly is supplied without O-rings or the Integrated Servo Support (ISS), allowing technicians to install compatible aftermarket or OEM seals. Always verify the vehicle’s transmission code, engine type, and model year before ordering to ensure proper fitment. Correct verification guarantees smooth hydraulic function, precise engagement, and long-term reliability.
For best results, pair this pump assembly with a complete transmission service, including new friction plates, bearings, seals, and a filter. Customers can also explore related components on our site, including 4L60E valve bodies, torque converters, rear planetary assemblies, and rebuild kits, to complete a full transmission overhaul.
Vehicle Compatibility
GM / Chevrolet Applications
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Chevrolet Silverado 1500 / 2500 / 3500 (V6 & V8): 2004–2006
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Chevrolet Tahoe / Suburban / Blazer: 2004–2006
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GMC Sierra 1500 / 2500 / Yukon: 2004–2006
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Pontiac Firebird / Camaro: 2004–2006
Fitment Notes
This 4L60E reman pump assembly fits 2004–2006 4L60E transmissions only. Always confirm the transmission code, model year, and engine type before purchase. Proper verification ensures hydraulic efficiency, smooth gear engagement, and extended transmission life.
Consult official GM service manuals for installation procedures, torque specifications, and assembly guidance.
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