Both, the drain rots out the frame hole for the body mount bushing. This requires a frame repair washer welded in. The majority of G bodies will require the passenger side #2 to be repaired, its a widespread problem. After cutting the bad metal out you can either weld the washer in flat or on top of the frame rail. I welded the washer on top as the body mount hole is in a depression in the frame rail so welding on top helps to reduce the depression. I also rigged up a little gutter under the HVAC drain to divert water to the ground.
