I recently purchased a used revo that needed some work. It had no axels in the front. It has a 3.3 engine. I ordered a set of axels for a Nitro revo 3.3. When I recieved them they were larger in diameter, about 3/8" longer and the shaft that goes through the wheel bearings is about 3/16" to short. Are there early and late model revo's? Does anyone have any ideas?