Vehicles with ZF8HP50, ZF8HP75 and ZF8HP95 transmissions may exhibit insufficient line rise in drive ranges, soft shifts and/or burnt clutches. These problems may be caused by continuous oscillation of the reducing valve in the sleeve, creating excessive wear and a path for critical cutback pressure acting against line pressure to leak to exhaust. Sonnax reducing valve kit 35740-38K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control. The sleeve also incorporates an O-ring to prevent critical fluid from leaking to exhaust.

• Sleeve is manufactured from highly wear-resistant billet aluminum to prevent future wear
• Hardcoat anodized aluminum valve combats premature wear
• O-Ringed sleeve provides positive seal to prevent critical line pressure fluid from leaking to exhaust
• Drop-in Zip Valve™ parts install quickly and easily