A worn boost valve or boost valve sleeve.
Restore proper line pressure control with closely toleranced boost assemblies, made from wear-resistant materials.
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 offers two replacement boost valve kits for these units: the OE ratio kit 37947-01K and the increased ratio kit 37947-03K. The 37947-01K has OE spool ratios, to return line rise to stock condition. The 37947-03K assembly has increased ratios for slightly higher line pressures.
|EPC PSI||37947-01K |
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
May 21, 2013
Topics: Vacuum Testing Vacuum Test Guides Transmission Ford 4R44E Transmission 4R55E Transmission 5R44E Transmission 5R55E TransmissionRead Now
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