Originally Posted by tabetha

Drive to your nearest gearbox repair place, they will test drive your car and tell you for free if it's the gearbox, personally I'd be 99% sure it wasn't the box, more likely a issue with adjustment, the vibes may well be from a buckled alloy/wheel on the inside, or a weight fell off from the knock ?
tabetha

Originally Posted by mattmountney

How would a buckled wheel stop me from putting the car in 3rd, 4th or 5th gear when stationary?