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Remember, transmissions have variations based on year, make, model and engine size, as well as for 2WD, AWD, 4x4, gas, diesel or hybrid and in some situations half years.  We encourage you to chat or call toll free with one of our knowledgeable staff members that will assist you in finding the correct part the first time and answer any questions you may have regarding parts for your build. Our goal simply put, is to get you moving with one order.

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A4LD TRANSMISSION Boost Valve Large Ratio Sonnax 56947-02K

Regular price $91.99 USD
Regular price Sale price $91.99 USD
Sale Sold out
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A4LD TRANSMISSION Boost Valve Large Ratio Sonnax 56947-02K

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.

  • 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

  • Sleeve
  • Valve
  • O-Rings (2)

Parts ship daily from our distribution center.


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This item is packaged for Professional Transmission Shops. It may also be packaged in transmission fluid as part of the manufacturing and distribution process and in no way means the item to have been used. We do not stock or sell used electrical parts.


WARRANTY requests need to be accompanied with the appropriate code as diagnosed by a professional transmission shop.

Vehicles must be professionally diagnosed for solenoid failure prior to purchase.

We cannot guarantee any one item will fix all transmission problems.

Solenoid failure is often accompanied by additional failures for example valve body failures, internal wear or damaged hard parts.

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