Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping Across USA
- No EU import duties. - Ships within 3-5 business days. (USA) - Ships with 8-12 business days. (International)
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
Line Pressure Booster Kit4L60-E, 4L65-E, 4L70-Efits Early-Style Pump Early-Style Pumpvalvesleevepressure Regulator Springo-Rings (2)Line Pressure Booster Kit 4L60E-Lb1 Fits Early-Style Gm 4L60-E, 4L65-E And 4L70-E Pumps. Sonnax Hydraulic Line Pressure Booster Kits Contain Stronger Pressure Regulator Springs And Large Ratio Boost Valves Designed To Work Together To Provide Progressive Pressure Increases As Driving Conditions Become More Demanding.Our Pressure Regulator Springs Are Approximately 10 Stronger Than Oe And More Conservative In Impact Than Other Aftermarket Kit Springs. Large Ratio Boost Valves Provide Higher Pressure Incrementally And When It Is Needed The Most. The Combination Of These Springs And Valves In A Sonnax Kit Gives You The Best Of Both Worlds: A Modest Pressure Increase At The Low End, With A High-End Pressure That Is Equal To Or Greater Than That Of Other Aftermarket Kit Springs.Achieve Shorter Shifts And Increased Torque Capacity Without Creating Low-Speed Harshnessimproved Band And Clutch Holding Capacity For Increased Durabilityprogressive Pressure Increase As Driving Conditions Become More Demandingall The Benefits Of Increased Line Pressure Without Overloading The Pump At Idlesimple And Affordable Drop-In Solution With No Special Tools Or Reaming Requirednote: Fits Early-Style Pump With Long 1.907' Sleeve Only. Use 4L60E-Lb2 For Later Pumps With Short, 1.810' Sleeve
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
Frequently Asked Questions
Q: What vehicles are compatible with the Sonnax 4L60E Boost Valve and Spring Kit?A: The Sonnax 4L60E Boost Valve and Spring Kit is designed to fit early-style GM 4L60-E, 4L65-E, and 4L70-E pumps, specifically those with a long 1.907" sleeve.
Q: How does the line pressure booster kit improve performance?A: This line pressure booster kit provides a progressive pressure increase as driving conditions become more demanding, resulting in shorter shifts, improved band and clutch holding capacity, and increased torque capacity without low-speed harshness.
Q: Is installation of the Sonnax 4L60E Boost Valve and Spring Kit difficult?A: No, the kit is designed for simple drop-in installation, requiring no special tools or reaming, making it an affordable and straightforward upgrade.
Q: What advantages do the pressure regulator springs in this kit offer?A: The pressure regulator springs in the Sonnax kit are approximately 10% stronger than the OE springs, providing a conservative impact while ensuring better performance under demanding conditions.
Q: Can I use this kit with later-style pumps?A: No, this kit is specifically for early-style pumps with a long 1.907" sleeve. For later pumps with a short 1.810" sleeve, you would need to use the 4L60E-LB2 kit.
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