The German, a four-time world champion, is 34 points behind Mercedes’ Lewis Hamilton with five races remaining, including Sunday’s at Suzuka.
The gearbox scare followed a bizarre incident after last Sunday’s Malaysian Grand Prix when his car was hit from behind by Canadian Lance Stroll’s Williams on the post-race slowing down lap.
The impact wrecked the car’s rear suspension.
A change of gearbox would have meant a five place grid penalty for a race that Vettel needs to win, but Ferrari gave the all-clear after a factory inspection.
“The gearbox Seb5 (Vettel) used in MalaysiaGP is still available,” Ferrari said on Twitter.
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It gives Vettel a boost going into the weekend, although he still faces a tall order pulling in the rampant Hamilton.
Hamilton extended his lead in the championship with a second-place finish in Malaysia after three straight victories saw him overtake Vettel.
And Hamilton is taking nothing for granted and thinks he still has his work cut out to clinch his fourth title.
“I feel good but I think we’ve got some work to do with the car,” he said.
“We didn’t have the pace in Malaysia as we can so there’s work to do.
“There’s still races ahead, some that we can for sure win but we’ve just got to keep pushing.”