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Sonnax 4R44E 4R55E 5R44E 5R55E Large Ratio Boost Valve Automatic Transmission
OPT Product Code: SNX-37947-03K$62.12
Product Details
Some typical problems in 4R44E, 4R55E, 5R44E and 5R55E units are soft shifts, delayed reverse, poor modulator control and/or low line pressure in reverse. A worn boost valve is often the cause, allowing reverse and/or TV pressure to cross leak or exhaust. Sonnax now offers two replacement boost valve kits for these units: the OEM ratio kit 37947-01K and the increased ratio kit 37947-03K. The 37947-01K has OEM spool ratios, to return line rise to stock condition. The 37947-03K assembly has increased ratios for slightly higher line pressures. Features & Benefits: Sleeves are manufactured from highly wear-resistant aluminum alloy. Valves are made from hard-anodized aluminum for better wear resistance. Tight tolerances restore the hydraulic integrity of the assembly. Kits improve engagement related to loss of boost oil and increased line rise in forward and reverse.
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