If it is an auto check for transmission slippage.....wuld indicate a possible VB issue. Rattling sound or whining sound would indicate timing chain uides are worn or broken and wil need to be replaced. Any vibration upon accel you will want to have the CV axles checked as well as the wheel bearings. This should start this off for you.
I had intended to post a reply yesterday with a hyperlink to another thread where I and others answered this question, but I got distracted in the midst of doing so. Anywho - the thread is out there and I did a surface level search, but couldn't recall what the title of the thread was. I'll keep looking and edit my post if I can find it.