Superseded Part Number: S34507RAK, 34200-10K
OE/OEM Part Number: S34507RAK
Interchange Part Number: S34507RAK, 34200-10K
Other Part Number: S34507RAK, 34200-10K
Fitment Type: Performance/Custom
UPC: Does not apply
Manufacturer Part Number: S34507RAK, 34200-10K
Brand: Sonnax
Hello, If you need assistance finding a part please supply the VIN number of your NORTH AMERICAN vehicle AND the part number you are looking for.4L80-E, 4L85-E
Boost Valve Kit
Part No. 34200-10K
With encapsulated relief valve.
Common problems in vehicles with GM 4L80-E and 4L85-E transmissions include uncontrollable line rise (upward of 500 psi), high line pressure in Reverse, broken direct clutch drums and/or broken cases. These problems can be caused by excessive EPC torque signal pressure. Sonnax self-regulating boost valve kit 34200-10K eliminates these problems by limiting EPC pressure.
- Hardened steel boost valve has an encapsulated relief valve that will allow EPC pressure to exhaust if it exceeds 95-105 psi
- 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
- Closely toleranced sleeve restores the hydraulic integrity between the valve and sleeve
- O-Rings have been added to the sleeve to provide a positive seal that compensates for pump bore wear
- Valve
- Sleeve
- O-Rings (2)
Valve Kit; Boost, With Encapsulated Relief Valve
Specifications
Transmissions
| Name | Years |
|---|---|
| 4L80-E | 1991 - 2009 |
| 4L80-E-HD/MN8 | 2002 - 2002 |
| THM-R2/MT1 | 1991 - 1991 |
| 4L85-E | 2002 - 2009 |