hey, i can get a grand marquis rearend for next to nothing and was wondering if it will fit in a 85 mustang gt. if so is it a direct bolt in? if not, why does it not fit, also he said there was a mustang rearend in there, but i highly doubght it, but is there away to tell if it is a mustang rearend in it? is all fords and mercury 8.8 inch rearends the same no matter the make and year is? also is the rearend cover on all 8.8s the same? thanks.