it is possible to remove the trunk drop off from the inside after welding however it will be easier to do so befor you do the 1/4. more access and much more room to move to work with tools. just measure your old drop off's position befor removing to ensure accurate replacement after you install the 1/4. you can install it after if you desire but removal is definately easier before!! also where r you in michigan? im not far from coldwater,mi. about an hour south.