5R55N, 5R55S, 5R55W

Increased ratio

Symptoms:

• Slip codes
• High TCC slip RPM at increasing load
• Overheated fluid

Cause:
The plunger force is transferred onto the inner modulator valve. When the sleeve wears, the converter apply pressure is reduced and TCC slippage increases.

Correction:
Sonnax TCC modulator plunger valve kit restores proper hydraulic clearances so fluid pressure can position the TCC modulator valve to fully apply lockup. The increased ratio assembly provides a firmer and quicker lockup feel.

Some common complaints associated with Ford 5R55W and 5R55S transmissions are high TCC slip RPMs under increasing loads, slip codes, and converter apply or release concerns. These complaints are often caused by wear at the I.D. of the TCC modulator plunger valve sleeve, due to constant oscillation by the pulse width modulated TCC solenoid. This plunger valve positions the TCC modulator valve, which feeds line to the apply circuit, which controls slip rate. Wear of the sleeve will allow the TCC slip rate to continue to rise, and could prevent full lockup.

The Sonnax TCC modulator plunger valve kit restores hydraulic integrity to the TCC solenoid circuit with precisely toleranced parts. The elevated modulated pressure will not raise apply pressure to the point of TCC piston fatigue, and will result in firmer TCC apply and reduced slip RPM in heavier use applications.

• Increased ratio provides a firmer and quicker lockup feel
• OE stock ratio restores original lockup feel
• Precisely toleranced parts restore hydraulic integrity
• Hardcoat anodized aluminum valve combats premature wear
• High-grade aluminum sleeves are extremely wear-resistant.

Note:
The valve bore inward of this TCC modulator sleeve wears rapidly. Always inspect for bore wear at the largest spool of the inner valve.

Contents:

• Sleeve
• Valve

SONNAX Installation Instructions