Recovering the last few digits of a Litecoin private key
First off: I don't know of any recovery tools (but didn't google for them either). What I'll explain is the difficulty to guess the correct address.

The wallet import format has 4 byte of checksum data. That's 8 characters. So losing the last 4 byte or part of them only loses / diminishes your ability to check for typing errors in the important part of the wallet import format instance.

8 characters in base58 (which is what the wallet import format uses) is log_2(58^8) bit = 46.86 bit. Subtract the 4 byte of redundant data from this and you know that you have to guess 14.86 bit (idealized (won't work out)). So after 2^14.86 = 29'738 guesses you have it for sure and stochastically the expectation is 14'869 guesses. That's entirely feasible (even non-idealized).

Everything you have after guessing is the so-called extended key. That's enough to derive your private key (which is what you need to send money) from it (just drop the first byte).

If you need it in wallet import format, after your guess you have to hash the extended key using sha256, take the first 4 byte (8 characters in hexadecimal notation, again), and add them to the extended key.

But there are classes which give you the public key if you enter the private key. And you almost got it. You probably also got the corresponding public key. So you need the write a script which tries all the possible private keys, calculates the public keys for them, and checks them against the public key you feed into the script. That's probably way faster than figuring out if there are funds in the wallet.