5x10, that's right. I have always assumed it was heat, but didn't think about softer springs. That would probably help, I always found it slipped a bit much for my taste. So I will give the softer springs and find some ceramic bearings. I agree the Muggy is not the lightest of trucks, but other then that I have had no real problems with the truck. It did get better with the vented bell, it was much worse, half a gallon maybe, 2 or 3 outings to the track. Now its better. I will give those solutions a try. Thanks for the help guys.