Craik is an engineer on Truex Jr's #78 Toyota, which the 37-year-old drove to victory in the season-ending Ford EcoBoost 400 at Homestead-Miami Speedway, a race which finished as a head-to-head battle between he and fellow Championship 4 contender Kyle Busch.
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The Brisbanite says that Truex Jr's series win is a reward for the team's effort after the #78 crew was the class of the field in 2017, taking a season-high eight race wins.
The triumph came amid a year of off-track hardship for Furniture Row Racing, mostly recently team owner Barney Visser's heart attack and bypass surgery a fortnight ago which left him unable to attend.
Furthermore, Truex Jr's longtime girlfriend is battling ovarian cancer, while crew chief Cole Pearn's best friend Jacob Damen passed away unexpectedly from a bacterial disease in August.
“We're having a few beers right now out the back of the truck, so it's been a good night for us,” Craik told Speedcafe.com from Homestead-Miami Speedway.
“Obviously we had the most emotions of anyone all season so it was really kind of fitting that we ended up winning the race and winning the championship.
“We think we were the fastest car all season and we ended up winning the championship so it was probably a relief for (NASCAR) as well given the points system and the way the play-offs work.
“Everyone's really happy, we're proud of what we've done, and it was really nice to cap off the season with the championship.”
Craik also played down the impact of being one of NASCAR's smaller teams, instead paying tribute to the workshop and road crew which work on the #78 Toyota housed in Denver.
“We're smaller (but) we're still a two-car team, going back to one car next year, but we've still got a bunch of guys,” Craik said.
“We're a customer of Joe Gibbs Racing, that's true, and we work closely with those guys but we're out on our own really in Denver.
“We've got a really good group of guys at the shop and we've got a really good road crew and it all worked out, and everything came together in the end. It's not really about the size of the team or anything.
“This team was sort of put together at the start of 2015, Cole was made the crew chief late-2014 and then he started hiring some new guys and I joined the team at the start of 2015.
“There's guys who have been at the shop since day one, so it was really a kind of a build-up from early 2015 when the new road crew was put together and we've started to work on new ways to do things and that sort of thing, so it's paid off after three years of hard work.”
Craik is not the first Australian to make his mark in NASCAR this year, with James Small filling in as crew chief on the team's sister car earlier this year.