Steve needed to address a letter to $2743$ Becker Road. He remembered the digits of the address, but he forgot the correct order of the digits, so he wrote them down in random order. The probability that Steve got exactly two of the four digits in their correct positions is $\tfrac m n$ where $m$ and $n$ are relatively prime positive integers. Find $m + n$.
1. **Determine the total number of permutations of the digits:**
   The address is 2743, which has 4 digits. The total number of permutations of these 4 digits is given by:
   \[
   4! = 24
   \]

2. **Calculate the number of ways to choose 2 correct positions out of 4:**
   We need to choose 2 positions out of 4 where the digits are correct. This can be done in:
   \[
   \binom{4}{2} = 6
   \]
   ways.

3. **Determine the number of ways to arrange the remaining 2 digits incorrectly:**
   Once 2 digits are fixed in their correct positions, the remaining 2 digits must be swapped to ensure they are in incorrect positions. There is only 1 way to swap 2 digits to make them incorrect.

4. **Calculate the total number of favorable outcomes:**
   Since there are 6 ways to choose which 2 digits are correct and 1 way to arrange the remaining 2 digits incorrectly, the total number of favorable outcomes is:
   \[
   6 \times 1 = 6
   \]

5. **Calculate the probability:**
   The probability that exactly 2 of the 4 digits are in their correct positions is the ratio of the number of favorable outcomes to the total number of permutations:
   \[
   \frac{6}{24} = \frac{1}{4}
   \]

6. **Express the probability in the form \(\frac{m}{n}\) and find \(m + n\):**
   The probability \(\frac{1}{4}\) is already in its simplest form, where \(m = 1\) and \(n = 4\). Therefore:
   \[
   m + n = 1 + 4 = 5
   \]

The final answer is \(\boxed{5}\)