whats the best modeling program

i want to start making my own mods but i dont know what a good free program for modeling cars and stuff it needs to be free or $5 or under thanks

 

Blender. It's free.

 

Blender is a free modeling program that most people here use I think. Here is a link to it: https://www.blender.org/download/
It is even used in the "vehicle creations" tutorial wiki here: http://wiki.beamng.com/Introduction_to_Vehicle_Creation

EDIT: Ninja'd by @AMG V12

 

thanks