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Ships within 48 hours · Estimated delivery Aug 19 - Aug 24
125" Steels
When the mainline pressure is increased with upgrades such as a high-performance transmission kit
Tooling Required: F-22771-TL19
Items Included: Servo Pin
080" thick)
Sonnax 37947-03K Transmission Boost Valve & Sleeve Kit 4R44E 5R55E 4R55E 5R44E wholesale 125" SteelsManufacturer Part Number: 37947 03K Other Part Number: S56741FA Brand: Sonnax 4R44E, 4R55E, 5R44E, 5R55E Boost Valve Kit Part No. 37947 03K Increased Ratio Some typical problems in Ford 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
