I have a 1999 LS 400 in excellent condition with 106,00 mi. I detected a slight buzz or vibration between 45 and 50 mph.(cruising, accelerating or decellerating) thought it was tires but installed a new set of tires but the buzz is still there. I have since noticed that the buzz stops if I put it into nuetral and coast. Any thoughts on this matter??????????

 

you better check and see if the tranny has any codes.

 

Try replacing tranny mount, $45. Then go from there.

 

Yeah I don't know what a tranny buzz is. But from what I think you mean I'd go with dashan and start with ge mount.

 

Do you notice any vibration on the gear selector? This usually indicates that the mounts are dead. Could be other issues to but this is pretty common and an easy low $ fix.

 

have you changed the transmission fluid yet?