Rattling Noise, Can anybody help me out. Options

[Stealths95GT]

So I purchased my Celica in March of '03. In April I started to hear this rattling noise when the vehical is reved. When I got to Washington state, I had exhaust put on and it covers it upa bit, but it's about time i fix it. Now, when i have the car is neutral and hits 4-5K on the tac, it rattles. put it in 1-4 gear and it doesn't rattle at all. but it does in 5th as well. I think it's a trans. problem but i don't wanna take it in to get it looked at when there is nothing wrong with it. if anybody knows for sure what it is or had this problem...let me know how ya fixed it...thanks again

~Stealth~

[Eddo456]

now this may sound somewhat stupid, but i have owned two sixth gen celi's and the same thing has happened on both, and please don't consider me ignorant when it comes to cars either, but on both of them the jack compartment in the back is in the wall of the hatchback, now i am assuming you have a hatch back, well my jack wasn't tightened against the bracket and was loose and rattled allot, and i couldn't find it until i let the car run and listened to everything, it would be worth a check huh? Just turn the jack so it is a bit taller and it will tighten right up, and maybe it will work????