There are people who have used the Older front axles for a tacoma sas. As mentioned they are narrower then your tacoma. There are a few ways to widen it, FROR tacoma brake kit, wheel spacers, Skys front axle widening kit, Back spacing on the wheels. I personally vote to get a after market housing built for the older diff and outers from your 84 housing. You would need to use new longer inner axles to make it work.