stabilize hu in 04 jeep grand cherokee

Hey all, In my Jeep one week ago, I installed the Kenwood KVT817-DVD with GPS, Sirius, iPod adapter, MTX amp & subs with other features. My question is this, everything is running fine and functional, it's just that when I removed the factory Infinity, I used a metra kit to fit the 1 din head unit into the dash and it all 'fit' okay, but the actual HU always wants to move around after sealing up the dash. The reason for this is obvious - behind the dash kit, I've literally got the HU sitting on a roll of electrical tape to elevate it into place because there is nothing in there to stabilize the head unit to! Removing the factory radio created a hole wider, deeper, and taller than the aftermarket dash kit and my HU. The unit came with a nice outer trim for the visible part of the unit while sitting in the dash kit, and its flimsy clip seems to be the only thing helping to hold the unit in place! How can I stabilize it once and for all?? I don't want it to be damaged as it always continues to move, ever so slightly. p.s. I'm getting noise coming out of my subs from anything electric in my Jeep, I'm guessing its a grounding issue. I couldn't find any good grounds, any suggestions for my model?

On the back of your OEM HU, there might (should) be a plastic clip, that is screwed/bolted to the back. In the dash, there might be a corresponding rail, onto which this clip will slide. When you removed your OEM HU, it probably had to slide off this rail. Once installed on the aftermarket unit, using the screw hole on the back if IT, you'll slide it back into the dash, and that will stablize your radio. As far as the noise? Make a lead that you can attach to the back of the radio (use the same bolt as the above mentioned one), and then attach it to a good solid piece of metal in the dash, with a self tapping screw. Clean any paint or corrosion from beneath it before you do so, though. If you are using a harness, it is possible that your factory ground might be inadequate, i.e. corroded, loose, etc.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Update: Got this all fixed, everything is perfect. Needed a new Metra kit for up front, brackets were missing from the one I purchased initially. As far as the noise goes, a basic ground loop isolator took care of all alternator noise in the subs - my grounds were fine.