DURAMAX 6.6L ALLISON TRANSMISSION FULL PREDATOR CONVERSION If you have ever wanted the ultimate in off road vehicles with the power and reliability of a Duramax diesel then look no further than this 2002 Hummer H1 Conversion by Preadator. You will not find another H1 with the options that this one has with six pages of options from the conversion. Please text or call Michael at 615-476-0327 to go over the vehicle in more detail and to be provided with the build sheet.