I need to find the specs for the rear frame rails on my '73 coupe. Is there a manual which gives dimensions or does someone have this information?

 

The best way to find out something like that is to go to seacrh and put is "1973 Mustang rear frame rail specs"

 

I realize this was posted a while ago, but I just joined the forum, and though I could help anyway. These are for a 1971-1972, but it should be the same.<IMG src=uploads/dohcramair71/66CAZ_chassis_dimensions_2.JPG border="0">