I guess my question is, will the whole rearend from a 97 Mustang fit under my 90. I want to change from 4 to 5 lug rims and I have seen other Fox bodys that have been converted. I would guess that a whole rearend change would be the way to go, but I'm not sure.

 

you swap axles not rear ends

 

OK, what do I need to do?

 

You use the search. Ask and answered tons of times. Here's a link to start you out.
http://mjbobbitt.home.comcast.net/~m...tang/5lug.html