Freaking sound from the rodeo

That car drives me crazy,

It's 2001 Isuzu Rodeo 2wd 3.2lt, 132k mileage, I got it when it was 120, I never hed serius problem since this month.
Drive Shaft bracket broke a week ago and found it from junk yard, cost me just $100 part and labor,
after a day servo cover jumpped out from transmission, over 10qt trans oil went out, cost me $200 part and labor, I would say it was fine..

But after mechanic guy replaced servo cover and filled fluid up I don't feel car is same as it was.. I'm having harder shift between 2 and 3 and a freaking sound just came up yesterday, i won't drive it like it, it will be towed to mechanic on monday but mechanic could not recognize when that sound comes from or wt* is mean.

I recorded it and uploaded to youtube, could you guys tell me what could it be?

I feel like mechanid guy did not fill fluid enough, he says he used 8 or 10 qt fluid which car takes up to 15 qt.

http://www.youtube.com/watch?v=bmUzOvF1yr4

"EDIT",
Problem is solved, it was Idler Pulley, cost me $50 with part and labor.