The B brake clutch in Chrysler 845RE, ZF8HP45, ZF8HP55 and ZF8HP70 transmissions is applied in Reverse, and 1st through 5th Gears, and maintains a controlled slip during neutral idle control (NIC) conditions. The B2 clutch NIC valve provides pressure to the release side of the B clutch piston - so clutch release is controlled by hydraulic pressure and not a return spring. As the B2 clutch NIC valve oscillates and strokes over time, bore deterioration results, allowing critical release pressure to be be compromised. This can cause harsh shifts, Forward and Reverse engagement concerns, flares, ratio codes and neutral idle control concerns. Reconditioning the bore and installing Sonnax oversized B2 clutch NIC valve 35740-22 revives normal shift operation by eliminating the wear that causes circuit leakage.

• Lengthened critical spool for added stability
• Hardcoat anodized aluminum valve combats premature wear
• Relocated annular groove maximizes valve centering, helping to avoid excess side-load wear