If you want wheelies with your truggy you need to have a motor with a lot of torque. I didn't see where you mentioned what truggy your running, or what motor is in it. Another thing to consider is what tires your running. My Rc8t with truggy tires gets shitty traction around my house. If I put my tires from my Mt4 monster truck on it, it hooks up. The tires that come with a truggy are good for a hard pack clay track and that's about it. If I were you I would start with tires, from there you can mess with the center diff fluid. The kthicker, the better. I can wheelie my rc8t with 10,000 wt. Oil, 15 tooth clutchbell and monster truck tires. I'm running an LRP .30x which has alot of torque! I had another truggy with a .26 motor and it would wheelie no problem also. All I did with that truck was add monster truck tires. The monster truck tires are just taller and hook up much better than truggy tires.