GM 4L30E 4-Valve Pump Assembly (1990–2004)
The GM 4L30E 4-valve pump assembly is a vital component for vehicles equipped with the 4L30E 4-speed automatic transmission from 1990 through 2004. This pump assembly regulates hydraulic pressure throughout the transmission, ensuring proper clutch engagement, lubrication, and smooth gear shifts. Its precision design allows the 4L30E transmission to maintain reliable performance under a wide range of driving conditions, including heavy loads and stop-and-go traffic.
Over time, worn gears, scoring, or internal pressure loss can reduce pump efficiency. Drivers may notice slipping, delayed engagement, harsh shifting, or overheating. Replacing the GM 4L30E 4-valve pump assembly restores correct hydraulic pressure and improves shift quality. Installing a new pump during a rebuild also protects clutches, planetary gear sets, and other internal components, ensuring smooth and consistent operation.
This 4L30E pump assembly fits vehicles using the GM 4L30E transmission only. Always verify the transmission code and vehicle application before ordering, as similar GM 4-speed transmissions may require different pump configurations. Proper identification ensures correct fitment and optimal hydraulic performance.
For best results, pair this pump with new seals, bushings, friction components, and a complete rebuild kit. Customers can also explore related parts on our site, including 4L30E valve bodies, torque converters, and hard parts, to complete a full transmission overhaul.
Below is a link to our 4L30 Transmission Parts in stock!
Vehicle Compatibility
GM Applications
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Chevrolet Astro / GMC Safari: 1990–2004
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Chevrolet S10 / GMC Sonoma: 1995–2004
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Chevrolet Tracker / Geo Tracker: 1990–2004
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Cadillac Allante: 1990–1993
Fitment Notes
This pump assembly fits GM 4L30E transmissions only. Always verify the transmission model, engine type, and production year before purchase. Proper verification ensures smooth shifting, correct hydraulic operation, and extended transmission life.
Consult official GM service manuals for installation procedures and torque specifications.
Below is a diagram!
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