i use THS racing CVDs on my revo, but dont have extended a-arms... it could be that the extended arms make it so the CVD wouldnt reach all the way and fall out... possibly. but with my integy arms, i actually couldnt tighten the axle carriers all the way down because the CVDs were too long.. so i think they would work ok. how much do the extended a-arms do? because fi it is only a few mm, then the ths racing CVDs should work fine