A number $\overline{abcd}$ is called [i]balanced[/i] if $a+b=c+d$. Find all balanced numbers with 4 digits that are the sum of two palindrome numbers.
1. **Identify the form of a four-digit palindrome number:**
   A four-digit palindrome number can be written as $\overline{abba}$, where $a$ and $b$ are digits. This number can be expressed as:
   \[
   1000a + 100b + 10b + a = 1001a + 110b = 11(91a + 10b)
   \]
   Therefore, any four-digit palindrome number is divisible by $11$.

2. **Condition for a balanced number:**
   A number $\overline{abcd}$ is called balanced if $a + b = c + d$. We need to find all balanced numbers with 4 digits that are the sum of two palindrome numbers.

3. **Sum of two palindrome numbers:**
   Since each palindrome number is divisible by $11$, the sum of two palindrome numbers must also be divisible by $11$. Therefore, a balanced number that is the sum of two palindrome numbers must be divisible by $11$.

4. **Divisibility by $11$:**
   For a number $\overline{abcd}$ to be divisible by $11$, the alternating sum of its digits must be divisible by $11$. This means:
   \[
   a - b + c - d \equiv 0 \pmod{11}
   \]
   Given that $a + b = c + d$, we can substitute $c + d$ with $a + b$ in the equation:
   \[
   a - b + (a + b) - d \equiv 0 \pmod{11}
   \]
   Simplifying, we get:
   \[
   2a - d \equiv 0 \pmod{11}
   \]
   This implies:
   \[
   2a \equiv d \pmod{11}
   \]

5. **Check for consistency with balanced condition:**
   Since $a + b = c + d$ and $2a \equiv d \pmod{11}$, we need to check if these conditions can be satisfied simultaneously. 

6. **Simplify the conditions:**
   From $a + b = c + d$ and $2a \equiv d \pmod{11}$, we can write:
   \[
   d = 2a - 11k \quad \text{for some integer } k
   \]
   Substituting $d$ back into the balanced condition:
   \[
   a + b = c + (2a - 11k)
   \]
   Simplifying, we get:
   \[
   a + b = c + 2a - 11k
   \]
   \[
   b = c + a - 11k
   \]

7. **Check for valid digits:**
   Since $a, b, c, d$ are digits (0-9), we need to ensure that the values satisfy the digit constraints. We also need to ensure that $a \neq 0$ since $\overline{abcd}$ is a four-digit number.

8. **Conclusion:**
   Given the constraints, the only possible values for $a, b, c, d$ that satisfy both the balanced condition and the divisibility by $11$ are when $\overline{abcd}$ itself is a palindrome. Therefore, the balanced numbers that are the sum of two palindrome numbers are palindromic numbers themselves.

   The valid four-digit palindromic numbers are:
   \[
   2002, 2112, 2222, \ldots, 9999
   \]

The final answer is $\boxed{2002, 2112, 2222, \ldots, 9999}$.