Product Description
455-50SN 55-51SN RE5F22A Shift Pressure Control Valve Kit
No tooling required
The shift pressure control valve in Aisin AW 55-50SN and 55-51SN units is biased by spring force and shift control (SLS) fluid pressure. This valve regulates Drive and Reverse fluid pressure to control the apply of the second clutch (B2), the second coast clutch (B1) or the direct clutch (C2). The constant oscillation of the valve wears the cast aluminum sleeve, allowing Drive and Reverse fluid pressure to leak and cause shift complaints and burnt clutches. Sonnax shift pressure control valve kit 59947-38K uses upgraded materials and annular grooves on the valve to correct the problem and prevent future wear.
- Hardcoat anodized aluminum valve combats premature wear
- Annular grooves on the valve hydraulically center it in the bore to prevent sleeve wear
- Drop-in Zip Valve™ parts install quickly and easily
Symptoms
- 2-3 Harsh
- 3-4 Harsh
- No 5th
- 4-5 Harsh
- Low Reverse pressure
- C2 Clutch burned
- B1 Clutches burned
- B2 Clutches burned
- High line pressure in Reverse
Cause
Oscillation of the shift pressure control valve within its sleeve causes wear, which will allow Drive or Reverse pressure being routed to the B2, B1 or C2 clutch to exhaust or cross leak. This will result in shift complaints and burnt clutches.
Correction
Restore proper hydraulic control by replacing worn parts with the improved, drop-in Sonnax shift pressure control valve kit.
Contents
- Valve
- Sleeve
