Pro Xe P1 Volvo S40 C30 V50 C70 AW-55 Transmission Valve Body Upgrade

Pro Xe AW55 Performance Valve Body Upgrade

Our Pro Xe AW55 valve body upgrade is designed to correct common shift issues, improve clutch apply timing, and deliver crisp, consistent gear changes under both daily and performance driving conditions.

This comprehensive upgrade package addresses known hydraulic weaknesses inside the AW55 transmission while optimizing line pressure through modified fluid ports for improved shift response and clutch holding power.

Performance Benefits:

• Modified fluid ports for optimized hydraulic pressure
• Faster, firmer, more precise shifts
• Improved torque capacity
• Reduced flare and slipping between gears
• Enhanced torque converter lockup performance
• Increased transmission longevity

What’s Included:

• Pressure Regulator Valve, Balance Pin, Retaining Clip & O-Rings (2 O-rings, 1 extra)
• O-Ringed End Plug Kit
• Solenoid Relay Valve Kit
• Solenoid Modulator Valve, Sleeve, Spacer Sleeve & Spring
• Boost Valve & Sleeve
• Lockup Relay Control Valve Kit
• B5 Control Spring
• LPC Accumulator Piston Kit
• Lockup Control Valve Kit
• Line Relief Spring (Red)
• Secondary Regulator Valve, Spring & Seals (2 seals, 1 extra)
• B4 Release & Reverse Inhibit Springs (2) – No Color
• Cooler Bypass Spring – Large, No Color
• TCC Check Valve Springs (2) – 1 Yellow, 1 White
• Valve Body Ready for installation 

This upgrade is ideal for stock and tuned vehicles looking to eliminate soft shifts and restore proper transmission function — especially in higher mileage AW55 units.

Built to handle power. Engineered for reliability.