which 8.8? there are a dozen different 8.8s out there. Ford threw it under everything from crown vics, to aerostars to the IRS explorers (uses an 8.8 center section). all have varying widths and bolt patterns. The one you'll be looking for are under 95-01 Explorers (right bolt pattern, nearly the right width, disk brakes). don't get a 3.73 unless you have a plan for matching in the front.