Car making a grinding noise at 35-40 mph in 5th gear, auto transmission

2002 ACURA TL
120,000 MILES
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DIVADOG
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My transmission was rebuilt last June 2011; the noise I hear is inconsistent but getting worse, it started about 2 months ago. When I hear the noise it seems to be coming from under the car because I feel it vibrating under the gas peddle. The car can be cold or hot, it doesn't matter and I am starting to feel the vibration in 4th gear and I hear a slight noise, not as bad as in 5th gear. I took it to the mechanic that replaced the tranny, he claims he can't hear or feel anything. The warranty is up in June so if this is the tranny I want to get it replaced before the warranty is up. Is this a transmission issue or something else?
Feb 16, 2012 at 9:16 PM
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HMAC300
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it could be a ujoint/drivshaft problem as well. have that check ed out
Feb 16, 2012 at 9:20 PM