I took my car to Toyota a couple months ago for them to replace my synchros. There was hella bad grinding in most of my gears. I am driving on the freeway getting up to speed, I shift from 5th to 6th at about 75 MPH and BAM! My car throws it back into neutral. I took it to a friend who works at a exhaust place, he looked at it, said its gotta be transmission... Then says I should bitch about the syncros. I had a 1 year warranty on the syncros.
Sorry folks, I had to get that out!