like a year and a half ago i got a mod for the blue bird school bus thing went so fast that it litteraly broke please someone bring it back
I'm fairly sure you're talking about this, https://www.beamng.com/resources/dansworth-d2500-type-d-rear-engine.1737/ which was rebranded due to blue doing dumb stuff like "protecting intellectual property" or some shit and the reason it used to go so fast was because it used a thruster instead of actual wheel and drivetrain based propulsion but that's not realistic your best bet is probably finding some ancient version on a 3rd party site somewhere
This might be a nice opportunity to learn how to add thrusters to a vehicle, it is extremely simple and you could even call it your first mod https://wiki.beamng.com/Thrusters