"We need to acknowledge the career Frosty has had here," team principal Tim Edwards said post-race.
"He’s one of the best in the history of this sport, and has been just as good off the track as he is on it.
"We’ll miss having him in our garage, but wish him the best moving forward."
Winterbottom finished the campaign 12th, the first time he's been out of the top six with Tickford.
Chaz Mostert led the way for the Ford team in a difficult season in sixth, with Cameron Waters 16th and rookie Richie Stanaway 25th.
Saturday's sixth-place finish for Winterbottom was the four-car squad's best of the Newcastle weekend, followed by seventh for Mostert on Sunday.
"It’s a bit of a tough way to end the season, with no real happy story to cheer on, but there is a lot to be happy about," Edwards added.
"We overcame a lot of challenges and are still P3 in the [teams'] championship, so we had an awful year but will move up pitlane next year, and of course there’s plenty of excitement about Mustang, we can’t wait to get it on track."