AW55-50SN, AF33-35, RE5F22A

Symptoms:

• TCC apply & release concerns
• Burnt converter
• TCC codes

Cause:
Continuous oscillation of the steel lockup control plunger valve wears the inside of the cast-aluminum sleeve bore, allowing converter apply pressure to exhaust and preventing proper control of the lockup control valve

Correction:
The tightly toleranced, Sonnax lockup control valve kit restores proper hydraulic clearances and uses upgraded materials to prevent wear.

In Aisin AW 55-50SN and 55-51SN units, the original equipment lockup control valve sleeve is prone to significant wear due to constant oscillation of the plunger valve, resulting a multitude of converter complaints. Converter feed pressure from the secondary pressure regulator valve is directed in part to this plunger valve assembly and becomes converter apply pressure. The plunger valve aids in correctly positioning the inboard lock up control valve to regulate converter apply. If this sleeve is worn, converter apply pressure is reduced and the converter may not fully apply. Sonnax lockup control valve kit restores proper hydraulic clearances and prevents valuable converter apply pressure loss.

• Sleeve is manufactured from highly wear-resistant billet aluminum
• Hardcoat anodized aluminum valve combats premature wear
• Salvages costly cores with minimal labor
• Eliminates the need for expensive OE valve bodies

Content:

• Valve
• Sleeve

SONNAX Installation Instructions