Howdy RKD, need a bit of clarification here.
Is it the primary drive or the donk that is getting hot?
It sounds like you're referring to the primary when you mention the noise, is that correct?
How many K's had it done when you got her?
How many K's she done now?
What was the oils like when you dumped them?
70000 should be good if it was looked after Dan, but you probably don't know it's history, so me thinks you might be better off taking it to an experienced mechanic, or dealer to perform an apraisal on it.
Compression test, oil pressure test, and so on. Trained ears will be able to diagnose any bad noises.
If theres nothing wrong at least you'll have peace of mind.
If there's a problem then you've made the right move.