Hilux gear grinding noise and bad rattle on engine when in park position?

[Striker73]

Hi guys, i have a mystery here, i have a 1996 3L TD special edition surf, it is serviced every year and has been for well since i have had it for 5 years now, i have just had a new water pump well about 2 months ago. Anyway one realy cold morning about 2 weeks ago when we had that severe cold weather i started my truck as normal, but noticed it started with the ignition key position in number 1? Instead of number 2! THEN the engine did not sound right it was clattering and out of syn it just sounded real bad but allso as i was in park the gears was grinding? It sounded like the gearbox, then i looked under the hood and i could hear a wizzing noise like a belt thats going round with too much effort an that was coming from the top end where it says Turbo!....BUT when i put it in to neutral postition it allso does the same thing, but as soon as i put it into Drive it sounds fine as smooth as it should and drives fine (touch wood)

I'm about to let my local garage have a look tommorow when hes open, just though i would ask anyone if they have a clue as to what the garage man is likely to say to me...at the moment i feel like this.....

Cheers guys..