I not sure what the highest note a trombone can play. Most of the method books I looked at go all the way up to a high F. Others go up to a high high D. I can play a high high D, but I wanna know if theres a note that is even higher then that.(I know you can play higher then that, but what is the highest note possible?)

NO!!! absolutly not. there is no limits on how high notes are that are notes. the only limits are on the bottom notes. never ever ever play on a mellophone trypet or french horn or you`ll lose your upper register in a snap.