Original OE plunger valve must be measured. Mismatched replacement sleeve & plunger will cause TCC apply and other engagement issues.
.486" OE large spool diameter
Symptoms:
Code 628
TCC cycling
TCC surge
No lockup
Lube failures
Excess cooler circuit oil loss
Cause:
A worn bypass clutch control sleeve allows regulated converter charge and cooler circuit oil leakage.
Correction:
These tightly toleranced, wear-resistant assemblies restore proper clearance to maintain hydraulic control.
Vehicles with Ford AX4N, 4F50N transmissions frequently have excessive cooler circuit loss as well as torque converter clutch apply and release problems. These complaints can be caused by severe wear of the bypass clutch control sleeve, allowing regulated converter charge and cooler circuit oil leakage. This oil is fed to the lube circuits, cooler, TCC and into the sleeve to help maintain the TCC in the release position. If the sleeve is worn, oil will exhaust past the plunger valve to the sump, thus compromising the balance, but more importantly, leaking critical cooler oil. Sonnax has developed two tightly toleranced bypass clutch control plunger valve kits, to eliminate these problems.
Precision sleeves are manufactured from highly wear-resistant aluminum
Original OE plunger valve must be measured. Mismatched replacement sleeve & plunger will cause TCC apply and other engagement issues.
.486" OE large spool diameter
Symptoms:
Cause:
A worn bypass clutch control sleeve allows regulated converter charge and cooler circuit oil leakage.
Correction:
These tightly toleranced, wear-resistant assemblies restore proper clearance to maintain hydraulic control.
Vehicles with Ford AX4N, 4F50N transmissions frequently have excessive cooler circuit loss as well as torque converter clutch apply and release problems. These complaints can be caused by severe wear of the bypass clutch control sleeve, allowing regulated converter charge and cooler circuit oil leakage. This oil is fed to the lube circuits, cooler, TCC and into the sleeve to help maintain the TCC in the release position. If the sleeve is worn, oil will exhaust past the plunger valve to the sump, thus compromising the balance, but more importantly, leaking critical cooler oil. Sonnax has developed two tightly toleranced bypass clutch control plunger valve kits, to eliminate these problems.
Contents:
SONNAX Installation Instructions