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in fith gear i also hear/feel the hum/vibration. it also happens in my saturn . if you ever notice it happens with almost any thing that has a motor in it, with a constant speed. ie........ computer, fridge, fan, washer. what it is, some thing is just a little off balance .
My 04 Aveo also does the same thing at 100Km +(60miles) in 5 gear. It hums for about 1 second, quiet for about another second then hums again. It's not really a noise but a slight vibration that is felt on the floor and gas pedal.
I had an intermittent humming in 5th when I got the car, I was about annoyed as you about it but I didn't bother doing anything cause I was so damn broke at the time I could hardly afford to even drive at all.
With time I have either stopped noticing it, or the noise has completely gone away. I do find that kind of strange, but I'm not too worried as this car has been pretty good to me. I am starting to treat her better. :D
If the transmission goes, just call the local junkyard.. 250 buks and BAM, a nice (often NEWER) transmission with 1/2 the mileage you had on the old one, sometimes under 30k and you can easily put it in yourself using a jack and stands and a few hand tools in 4-5 hours :wink:
that ^ or you spend what the dealer would charge you and upgrade..
:)