lx5.0

i have a vibration that comes and goes and you can feel it thru the shifter. You can start to feel the vidration when im at a high speed and if i go faster vibration goes harder, but whats weird is that one time i was driving at high speed and put the car in neutral and you can feel the vibration barely then all of a sudden vibration comes in hard thru shifter, on other days you can barely feel it but sometimes all of a sudden car vibrates bad and its always at a high speed my speedometer dont work so i cant tell you at what speed it comes thru but you can always feel the vibration when the car goes wot at high rpms starting in 3rd gear or if im driving normally you can start to feel vibration in 5th gear at 2300 rpms what could be causing this?

toofst4u666

well if its only in thrid gear it could be a trans problem,like a warped gear, or a warped flywheel or since its at highspeeds you driveshaft could be out of balance all of those would cause a vibration in the shifter