GM / Chevy 4L60E Pump Assembly 2004-Up 300mm PWM ISS Hole

The GM/Chevy 4L60E pump assembly (300mm, PWM, ISS hole) is a critical hydraulic component designed for vehicles equipped with the 4L60E 4-speed automatic transmission from 2004 and newer applications. This pump assembly is responsible for generating and maintaining the hydraulic pressure required for proper clutch engagement, smooth shifting performance, torque converter operation, and overall transmission functionality. Built to meet OEM specifications, it provides dependable performance for passenger cars, trucks, and SUVs operating under both everyday and demanding driving conditions.

As transmissions accumulate mileage, pump wear can lead to reduced line pressure, delayed gear engagement, slipping, erratic shifting, transmission overheating, or diagnostic trouble codes. Replacing a worn or damaged pump assembly helps restore proper hydraulic operation, ensuring consistent shift quality while protecting clutches, bands, planetary gear sets, and other vital transmission components. Installing a quality pump assembly during a transmission rebuild helps maximize durability, reliability, and long-term performance.

This 300mm 4L60E pump assembly features a Pulse Width Modulation (PWM) configuration and includes the Integrated Servo Support (ISS) hole, making it suitable for specific 2004-up 4L60E transmission applications. Always verify the transmission model, pump design, transmission code, and vehicle application before ordering to ensure proper compatibility. Correct identification is essential for maintaining hydraulic efficiency, shift accuracy, and transmission longevity.

For optimal results, pair this pump assembly with a complete transmission service or rebuild, including new friction plates, steels, bearings, seals, bushings, and a transmission filter. Customers may also browse our selection of 4L60E valve bodies, torque converters, planetary assemblies, sun shells, and master rebuild kits to complete a comprehensive transmission overhaul.

4L60E Transmission Parts

Vehicle Compatibility

GM / Chevrolet Applications

• Chevrolet Silverado 1500 / 2500 / 3500 (V6 & V8): 2004-Up
• Chevrolet Tahoe / Suburban / Avalanche: 2004-Up
• GMC Sierra 1500 / 2500 / 3500: 2004-Up
• GMC Yukon / Yukon XL: 2004-Up
• Chevrolet Express / GMC Savana Vans: 2004-Up
• Additional GM rear-wheel-drive vehicles equipped with a 4L60E transmission utilizing a 300mm PWM pump with ISS hole configuration.

Fitment Notes

This 4L60E pump assembly fits select 2004-up 4L60E transmissions equipped with a 300mm PWM pump and ISS hole design. Always verify the transmission code, model year, engine application, and pump configuration before purchase. Proper verification ensures correct hydraulic operation, smooth gear engagement, and long service life.

Consult official GM service manuals for installation procedures, torque specifications, and transmission assembly guidelines.