(didn't mean to hijack the thread-sorry TimG!)
Thanks for the help, guys. For me, like Rodknock, putting my hand and pushing rearward stops the vibration. I replaced a few rivets on the rear bulkhead and it helped a little. The diff cover in the trunk is ok. As Sandwich said, the trunk floor that touches the rear bulkhead is the culprit, but the rivets are so darn close to the wall that my rivet gun doesn't sit flush (and I didn't want to remove panels). So, I took a rivet gun "head", grinded it to roughly a 30 deg angle (so the gun can sit flush next to the close wall), and installed rivets. I had a 50% success rate (some rivets just never got tight or the head was not flush to the floor). I did get them all installed, and the noise is better, but still there
Maybe someday the panel will come off. Better yet, if I go to the Kirkham anniversay, I'll probably leave my Cobra there for a re-job like Rodknock.
BTW, TimG, why did you sell your CSX to begin with? Many would consider an ally CSX to be the ultimate, or penultimate
, in the fakey-doo realm.
And post pics!