Product Description
Our SKU: 1406A
Fits: 4L80-E, 4L85-E
The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheating. Additionally, in '99-later vehicles, the factory EPC pressure was set high at idle, resulting in engine surge conditions in GM 4L80-E and 4L85-E units. Sonnax lube regulated pressure regulator valve 34200-14K provides a significant increase in cooler flow under low RPM and high pressure conditions that benefits all vehicles, and eliminates the need for reprogramming '99-later vehicles with high EPC pressure at idle. The replacement pressure regulator valve has an encapsulated check valve that allows regulated flow to the converter charge/lube circuit at vehicle idle.
- Check valve prevents converter or pump drainback
- Improves converter release pressure
- Prevents engine surge at idle in '99-later vehicles
- Drop-in Zip Valve® parts install quickly and easily
Valve Body Layout
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
GM 4L80-E, 4L85-E Valve Body Layout
Symptoms
- Engine surge at idle
- Low cooler flow
- Low TCC release pressure
Cause
Low converter release pressure at idle.
Correction
Sonnax drop-in lube regulated pressure regulator valve allows regulated flow to the converter charge/lube circuit at vehicle idle, while preventing converter or pump drainback.
