Re: vibrations?
2003 5.3, 4L60E, DBW, all stock, except for the tune.
I loosened up the exhaust and drove it but that did not change anything.
The mounts are DirtyDingo with new rubber, stock stands and they are tight, rear trans mount is new also, X member is moved to the rear 1 3/4 " no other changes and nothing than I can see is rubbing on the chassis.
I had the dog house removed and I did not have any interference with the firewall
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