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Well there's a good picture of why not to run Air shocks on a Mopar....As far as drilling out the spot welds for the inner wheel well, take off the rear wheels and drill them out from the outside. Changing out the rear crossmember opens up a whole new can of worms for you. Taking off the rear fill panel isn't too bad; just connects to the pan, gutters, X-member lip, and tail light buckets. The crossmember ties into the frame rails, shackle mounts, fill panel, extensions, and pan. Bunch more work and if it does in fact need to come out, be sure to jig, secure or measure reference the frame rails/shackle mounts before moving forward with it. They will move a bit. Save that spare tire/jack mount if you can and the trunk latch support. The AMD fill panel will come with the reinforcements, but not the latch support. I would also recommend you document the location for the two J-bolt mounts to transcribe to your new pan