What we have here is an HPI Savage 25 Savage 21 transmission case but the third gear has been installed also the reverse gear has been installed I have not ran this transmission all the gears look exceptionally good it spins very freely it is not locked up in any way the spur gear could be changed but it is functional please check the pictures for condition thank you for looking happy bidding feel free to contact the number that is in the posting for any additional questions concerns or pictures.