Replacement Valve body and shift solenoids.
https://www.ebay.com/itm/114437819053?_skw=5r55w+valve+body+shift+kitted&epid=1456818319&itmmeta=01JZEJFGVBMEN23C73PYH9H934&hash=item1aa5068aad:g:QmsAAOSw5PlhxDWk&itmprp=enc%3AAQAKAAABAFkggFvd1GGDu0w3yXCmi1cRRB7wN9dI3pKeo%2Bfu5qorJbku5TJXv2QDvrxbkZxLGsyO3ivDBM7H2uZZ1x%2BCV%2B3VmM4q4tCIw9XAocxzRAIl0wPpUoCPJNkLS4gSfyIKhwjTGEZUaWcPrCxdqbvTQ21fFuCXlD8hs9DCzMz8rPnZ2XMolc0C5GUnn7mTJ0of7Z91krcFO9umg3rBrCLNrDKvJaQbbktn0RinTNcTuLA%2B6ylDZBxNJo9KfiUE6EMRfTfjEGu63RcZTsaS0KWpnLgnMhfLrJhVHVrf8u1xiljz7M5rnEhQ6RJ0vQT%2FCS62eA%2BFbd6dq%2Bu8wgbeX72iaQs%3D|tkp%3ABFBM3o6-0vtl
Did you find anything?
Apparently theres upgraded valve bodies online that have been rebuild and refurbished.
I'm not sure on the 5r55W which is the falcon box apparently, will have to do some more research.