Description: 4L80E 4L85E Transmission Sonnax Boost Valve Kit Symptoms:Broken partsBuzzing noiseHigh line pressureHigh line pressureUncontrollable line rise Cause:Worn boost valve sleeve allows reverse oil leakage and worn end plug causes imbalance of pressure regulator valve Correction:Ensure proper main regulator valve control with this boost valve and sleeve kit with O-ringed balance oil plug. Replaces 1991 - current OE boost valves.Factory style sleeve, no O-rings Common problems in vehicles with a 4L80-E transmission are uncontrollable line rise (upward of 500-600 psi), high line pressure in reverse, buzzing noise, broken direct clutch drums and/or broken cases. These problems are usually caused by reverse boost oil that enters the torque signal circuit due to a wear-created cross leak at the sleeve. High line pressure and buzz is created by oil leakage past the aluminum balance plug. The Sonnax replacement assembly 34200-03K eliminates these problems.Hardened steel boost valve with over 20% wider spools to provide better durability and increased sealing contact area.Boost valve spools have annular grooves to reduce side loading that causes wear.Valve and sleeve are manufactured to close tolerances to restore proper clearance and hydraulic integrity.Kit includes a replacement aluminum balance oil plug with an O-ring to ensure proper sealing and adequate back pressure on the pressure regulator valve.Kit contains instructions to retrofit parts dating back to 1989.NOTE:If you detect leakage between the sleeve and pump bore, use 34200-01K, which includes an O-ringed sleeve to compensate for pump bore wear and prevent pump scrappage. Kit includes instructions to retrofit parts dating back to 89.This is an actual picture of the item for sale. This is NOT a generic picture. Please provide a valid United States Postal Service mailing address (Mail) and a United Parcel Service shipping address (UPS Brown Truck) in the note field when you complete your check out. We will ship worldwide! If your country is not listed as a ship to location, please contact us for a United States Postal Service Priority Mail shipping price! *If you don't see what you need here, contact us and we will list it here on eBay. We have hundreds of bearing kits and all kinds of hard parts available. You can reach us by calling toll free 1-866-223-5656 ext 5 and # or messaging us through eBay with any questions you may have.
Price: 25.2 USD
Location: Redding, California
End Time: 2025-01-01T22:24:57.000Z
Shipping Cost: N/A USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
Returns Accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Manufacturer Part Number: 34200-03K
Brand: Sonnax
Fitment Type: Performance/Custom
