Tm165 powercommand supersteer

*suspected tooth chipped in gearbox, makes a click click click noise in every even numbered gear* Was working perfectly every day until this problem occured. Has been parked since June. 180hp in around. Supersteer is a mighty job. Tractor is as handy as one half the size. Head done, new rad, new water pump, new brakes, pto pack and brake is working fine. Piped for a fusion. 650 and 540 tyres, backs are very good, fronts getting a bit down but have life left in them yet.