annoying noise during take off
thx!
For example, do you hear the noise if you get the car rolling in 1st gear and allow it to coast (at idle RPM)? What about if you allow the car to roll in 1st for a while, but then suddenly "punch it"? Does it make noise then?
When I performed the same job (in January), my motor was no longer supported at the rear and was held solely by the motor mounts. This causes the motor to angle downward and puts stress on the motor mounts. This causes any weaknesses in the rubber mounts to become further degraded. So, once everything is put back into place (tranny back in) the weak mounts allow the motor to move just slightly more than before the work was performed. This in turn allows the Y-pipe to move a little more than before and it can hit against the undercarriage, causing the "metal rubbing" noise you talk about.
A quick way to diagnose, is to take a short lenth of 2X4 (maybe 6 inches) and wedge it between the Y-pipe and the undercarriage of the car on the driver's side (since this is the natural rotation direction of the motor) and go for a quick drive. See if the noise goes away. If so, then new motor mounts are in order.
Of couse, it could be something else, but I'd start with the easiest things first...and this is a pretty simple way to confirm if your problem is with the Y-pipe.
Good luck and let us know your findings.
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i havent had a chance to look at ne thing cuz of work
if you guys think it has to do with a bearing or what not, should i take it back to where it was worked on and have them take a look? 



