I just purchased our first ATV, 2004 Magnum 330 4X4. Read through the post and the information has been spot on. It needs oil cooler lines and a rocker box gasket. Other than that it is actually really clean. An elderly couple is who I bought it from and they have owned from new, it has 1400 miles and runs out good. My question is what kind of fluid should I put in what I would call the transfer case/4WD unit. What level should I fill it to. All the other fluids are full to the plug, should I do the same here?