Product Description
Tooling Required
- F-59947-TL16
- VB-FIX
455-50SN 55-51SN RE5F22A Oversized Secondary Regulator Valve Kit
Aisin 55-50SN, 55-51SN secondary regulator valve bores are very active, and subject to wearing the casting bore. This valve regulates converter feed pressure according to throttle (SLT) pressure, and also is the primary distributor of lube flow throughout the transmission. Wear at the valve bore diminishes the valves ability to supply proper converter and lube pressure, resulting in converter related complaints and rapid bushing failure.
The Sonnax oversized secondary regulator valve kit 59947-16K restores proper hydraulic clearance after reaming with F-59947-TL16. The front spool of the Sonnax valve has been lengthened significantly, providing more support to prevent future wear.
- Salvages valuable core
- Improved valve support to reduce wear
- Improved converter feed and lube flow
- Hardcoat anodized aluminum valve combats premature wear
Symptoms
- TCC slip
- TCC surge
- Overheated fluid, bushings & converter
- Poor shift quality
- Harsh Reverse
- Low lube oil flow
- Bushing failure
Cause
Bore wear at the spring end of the valve allows the SLT circuit and regulated converter pressure to cross leak. Bore wear at the balance end of the valve reduces converter and lube flow.
Correction
Install the Sonnax secondary regulator valve and spring kit to restore hydraulic integrity to the circuit.
Contents
- Valve
- Spring
