As stated, all you need to do is use the search. This is just stuff from page 1 of 5 in results dealing with SAS...

http://www.fordrangerforum.com/proje...ild-thred.html
http://www.fordrangerforum.com/proje...axle-swap.html

and here is a link from another hit on the first page...
http://www.therangerstation.com/foru...ad.php?t=31292

There are also other ranger forums that have this info as well like RangerLuc said.
Also, check below the quick reply box, there are related threads that are showing 5 axle swap threads right now....

This is the research that was suggested you do before you ask questions. With about 10 seconds of work I found this information for you. Imagine what you could do if you took the time to look since you actually care about how to do an SAS.

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2003 Ranger 4Cyl 2.3L XL Styleside bed
Pioneer DEH-3100UB, Lund Genesis Tonneau, grill painted black, black front emblem, clear corners, ultra-guage, LED cluster.