I'm pretty sure it won't really help if you pay it off early. If you're applying for a mortgage, it will help your DTI, but as far as FICO goes, paying off a loan early doesn't necessarily mean you are any more or less responsible than someone who paid it off based on the original terms - so it doesn't help or hurt your scores.
For a boost to your credit scores, you'd probably be better off paying off all revolving debt (with less than half of your accounts reporting less than 10% utilization).
