Those fluids will work fine. Your Mustang does have a limited slip, but whether or not it still works is another story. The traction-lok could probably use a rebuild after that many miles. Take it out and see if you can get both rear wheels to spin when you take off from a dead start.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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