honestly, if you have to go up hill pretty hard for it to make a sound it's probably just pebbles kicking into your rear bumper. and small road imperfections just making it jump about. happens all the time for me if I'm near a dirt road, construction, etc.
edit, just read that it was a thud of some sort.
do you drive an auto?
I remember when I had an auto for my old g35 after some miles transmission started thudding every blue moon under different circumstances.
Last edited by KrnAndy; 06-16-2017 at 03:14 AM.
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