When in second gear (only second) there is a knocking noise coming from the gearbox. It still drives but sounds unhealthy. It only just occured when I took the car for a spin to test the brakes after changing the fluid. I wasn't really giving it much, It seemed to come out of nowhere, I went around a corner at about 3500rpm in second and accelerated out to about 5500rpm, smooth change into third, T intersection approaching, pressed on the brakes, clutch in, back to second/first. Stop at T instersection ease out of first into second and the knocking begins. Coast it home about 1km without using second gear.
Any ideas? New gearbox time?