Belts look fine but appear a bit tight, but diffs and outdrives are likely well worn, especially if a 3S lipo and SCT motor were used for bashing. I believe that the TC5 was still using Imperial hardware as did the TC3 and TC4 so double check. Give it all a good clean, replace crunchy bearings and go have fun. I recommend a Hobbywing XR10 Justock speed control for stock racing as these are inexpensive and bullet proof.