At 100K I would have the transmission flushed and fluid/filter changed and the rear differential oil drained and replaced. I would hope you have had the brake fluid replaced a time or two by now, if not you are way over do and should have that done too... Have you ever had the cooling system completely flushed?? Power steering fluid flushed??

I am a believer in changing out all fluids every so often to keep fresh stuff lubing and cooling properly....