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Reversed Differences

abc
- cba
-----
(a,b,c in some order)

In the above difference equation, a, b, and c are three distinct digits.
When the three digit number cba is subtracted from the three digit number
abc, another three digit number results, composed of the digits a, b, and
c in some order. Find the corresponding digits.
Repeat the problem for N digits (4<=N<=10).
That is, subtract an N-digit number from
its reverse to result in another N-digit number, such that each of the
three consist of the same N distinct digits.
Try to find the answer with the largest difference.

Source: Original extension of a problem from
The Little Giant Encyclopedia of Puzzles.

Solution

Mail to Ken