For some reason I am now unable to shift down to 3rd. I can shift out of it but I can't shift down to it. 1 and 2 to 3 is fine but 4 or 5-3 and im grinding Does anyone know what may be wrong here or am I retarded? I have tried at various rpms and have been able to find a sweet spot of any sort and I don't want to grind gears trying to figure it out and make it worse.