njvt13

Recently, my 2023 Silverado 1500 3.0 was at the dealer. They repaired the #2 hold down stud (as shown in diagram for TSB PIT6300B, which had broken off and was missing from the catalytic converter mounting bracket. A portion of the stud was still in the engine block. They were able to extract the stud and replace the hardware. Now, I am experiencing even worse harmonic vibrations, when accelerating under light load. Again, it is the same exact buzzing/vibrating that I was experiencing prior to the fix, but now it is worse. I crawled under the truck and noticed they mounted the bracket in a different position (see photograph). They shifted the bolts over about 3/4 inch. In the photograph, you can see the old mounting positions. i’m wondering if the bracket assembly and catalytic converter is closer to the engine block now causing increased harmonic vibration?? Has anyone else had this repair and experienced the same issues afterwards?