You need to send pics as the previous owner might not have know what he was talking about it does happen. Most overload springs don't raise the truck in fact don't do anything untill truck is fully loaded. Take a few quick pics and post em and then we can give good advice. My guess is as most people think there ram sits higher than stock which is because they do sit higher than most other trucks is that is is stock. You want to be sure what you have before you buy any parts.
2000 Dodge Ram 2500 4x4 Ext Cab V10, 12" Suspension, 3" Body, 46x19.5x20 Baja Claws