Sonnax 4L80E 4L85E Transmission Boost Valve Kit 34200-03K

Sonnax 4L80E 4L85E Transmission Boost Valve Kit 34200-03K
- 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.
- 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.
- Hardened steel boost valve with over 20% wider spools to provide better durability and increased sealing contact area.
- 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.
4L80E 4L85E transmission Sonnax boost valve kit .Symptoms: broken parts, buzzing noise, high line pressure, high line pressure, uncontrollable 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.
Country USA
Brand Transparts Warehouse
Label Sonnax
Manufacturer Sonnax
ManufacturerPartsWarrantyDescription Parts
MPN 34200-03K
PartNumber 34200-03K
Publisher Sonnax
Studio Sonnax
ReleaseDate 0000-00-00

Country	USA
Brand	Transparts Warehouse
Label	Sonnax
Manufacturer	Sonnax
ManufacturerPartsWarrantyDescription	Parts
MPN	34200-03K
PartNumber	34200-03K
Publisher	Sonnax
Studio	Sonnax
ReleaseDate	0000-00-00

Sonnax 4L80E 4L85E Transmission Boost Valve Kit 34200-03K

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