95 aspire, noise behind dash

Hello, I've got 110,000 miles so far everthing runs well, But new problem sounds like the speedometer cable is coming apart inside the dash. the faster you drive, the louder it gets. And yes the kids just turn up the radio to maks the noise. any suggestions would help. we are going to pull the dash this afternoon and see whats clanging in their. the speedometer cable is tight inside the engine compartment. any suggestions ?:banghead: