If you use Ford ( Racing Products or Motorsport) gears, chances are you won't need different shims, but you still have to check everything to make sure. I know when I did my 3.73's (Ford gears) the old shims were perfect.
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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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