my truck is my truck is making a loud roaring noise in 3rd gear also makes in 2nd and 5th but is getting worse in

Hello, Since the noise is dependent on gear selection, it is likely the transmission. There may be a bad bearing, low amount of lubricant, or other issues depending on the type of transmission. Either way, it will need to see a transmission specialist before deciding whether to rebuild or replace. Now, if vehicle speed changes make the sound go away while you stay in 3rd gear, you may not have a transmission issue, but that is likely not the case.