4L60E NEW SONNAX 77898E-K REVERSE BOOST VALVE AND SLEEVE KIT 1993 THRU 2004.

THIS IS A NEW NEVER OPENED SONNAX REVERSE BOOST VALVE AND SLEEVE KIT FOR THESE AUTOMATIC TRANSMISSIONS;

GMC   CHEVY   BUICK  CADILLAC  OLDSMOBILE  PONTIAC

• 4L60E 1993 THRU 2004
  

THIS KIT USES UPDATED O'RINGS TO SEAL BETTER AND HAS EPC SPOOL VALVE (INNER VALVE) DIAMETER OF .490" STOCK IS .470"

COMPLAINT;

• Insufficient line rise
• 3-4 clutch failure
• Poor shift quality

CAUSE;

• A worn boost sleeve can allow torque signal and reverse oil cross leakage or leakage to sump

CORRECTION;

• These closely toleranced valve and sleeve kits restore hydraulic integrity and prevent leakage.
• These kits valves are in .490" increased boost ratio sizes.

SONNAX PRODUCT SUMMARY;