LuckySC400

Lexus of Austin did the 90k service on this car a month ago and now it makes this high pitched sound around 5k in first gear. It doesnt do it at this rpm in any other gear so I assume its the tranny. I know they overfilled both engine and transmission, does that harm either? Anyone have any idea what this squeal could be? Car runs like a bat out of hell, it just makes this racket that sounds ominous.

Thanks!