I have a 2010ish cub cadet lawn tractor, 24hp, model LTX1050. The transmission seems noisy. I think it is normal that hydro static transmission makes a kind of buzzy/whiney sound when engaged (correct me if I am wrong). My transmission makes that sound on steriods. It is more of a load groaning sound. Any ideas if this is normal, abnormal, bad, indifferent, etc? Things to look for? Could low trans fluid cause this?