Traxxas Pro series magnum 272r transmission is awesome 

This New 272r tranny is one of the best upgrades you can do to any of your 2WD Traxxas cars. Bandit, slash or rustler will work amazing in all of them. Now if your not having any issues with your original tranny then theirs really no need to upgrade. Now if your racing your car and driving on the track and you want some better performance then this is it.