ya every version has its problems, .37 has lag problems, .38 not all trucks work as good as .37,idk what is wrong with .39 but im guessing its the same as .38, it would be nice to move to .4.2 but it would be a lot more work than lower versions, i would like to see 4.2 become the main version than .37 but its a lot more work for people to do that they dont want to do.