The band was rumoured to be on the verge of a split earlier this year (14) due to Young's health troubles, but they vowed to press on after the musician decided to step down for a hiatus.
Johnson has now revealed the rockers are plotting a new tour and could be back on the road by the end of the year (14).
In a message posted on his car racing webpage, Johnson admits he will have less time to focus on his love of motorsports and his Tv show Cars That Rock because he is returning to work with Ac Dc.
He writes, "We hope to bring you more (car racing Tv) shows in the near future but, of course, there is the slight distraction of my day job with Ac Dc - and it looks very likely that we will be on the road again before the end of the year. So stand by for more music - and more Cars That Rock. Thanks - Brian."