Well, a friend of mine bought a TMaxx 3.3 and then went crazy buying upgrades for it. Anyway, he ended up putting in an aluminum bulkless conversion. Anyone familiar with doing this? I am not at all. Anyway, now that it's all installed and everything... his truck won't roll forward like mine does. Mine will roll freely across the ground... because nothing is engaging. His truck, if you push it on the ground, the wheels just slide, unless you put some force down on them, then they will rotated with the driveshaft and stuff. But it doesn't roll freely. ANY solutions or ideas as to what this would be?