Typical problems in vehicles with a Ford A4LD transmission include low line pressure in forward or reverse, soft upshifts, delayed reverse and poor modulator control. These complaints can often be caused by a worn boost sleeve, which allows reverse and/or TV pressure to cross leak or exhaust. Sonnax high ratio boost valve kit 56947-02K with O-rings replaces worn parts and offers higher line rise than the OE-style, low-ratio valve. 56947-02K 56947-05K Ratio High Low Ø A .388" .323" Ø B .571" .571" Ø C .634" .606" Engine 4.0L 2.3, 2.8, 2.9, 3.0L High-ratio valve with O-rings offers higher line rise than the OE valve Manufactured from highly wear-resistant aluminum Valve is hardcoat anodized to reduce wear. Contents Sleeve Valve O-Rings (2)