Your beeping over 75 mph is usually accidently turned on after your car is in for service & had a DRBIII hooked into the system. It falls under the (customer preference) portion of the DRBIII & is either on or turned off by the tech. Theres no speed choice avail. other than on at 75 mph or not on at all. The only way to remove your beep is to have a DRBIII hooked up again & the choice turned off. Simple procedure but costly if you have to take it to someone who has this tool. We live in diff. parts of the country or I would be glad to turn it off for you. Hope this helps.
Crossfireone