[Richard]

Do not see a drive shaft in pics posted. Not even sure what is needing space? See some kind of frame brace in front of the aftermarket crossmember that does not look stock. To me it looks like it is installed upside down maybe turn it over? When stuff hits notch as much as needed and provide as much re-enforcement as you think is necessary. Custom fabrication is as needed. I try to make everything as strong or stronger than it was originally. Though it is all garage engineering. So the results may not be as expected.