Hello everyone, another question.... I recently had my catalytic converter replaced due to a weld break right at the engine side of the entrance to it so i got a new one welded in....about 1000 miles after installation, i now hear a rattling sound every time the automatic transmission is about to shift, mostly around 2400 rpm.. Is this common or is there any places I should look to see if it rattles? I just need some direction....

 

the exhaust/cat shield is usually the culprit.