Hand strength vs different ranges

You have top pair decent kicker on a dry board in both cases.

Against a 8/6/1.0 and facing aggression you hold crap and can profitably fold.

Against a 70/40/5.0 and facing aggression you hold the nuts and can profitably stack off.

This is really general... but forming ranges comes down to "what hand will I do what with against what range" and this is the most extreme example I can think of.

Am I on the right track?

I think your still looking at it too generally. Here you make no mention of preflop action, other reads, history, etc. You may want to stack off with KJ against a 70/40/5 if you raise PF and he calls and the board is J73r. However, if you raise preflop and he 3bets, then he cbets the flop of J37r obviously changes in strength. It may still be correct to stack-off, but it is obviously a different situation than before even though you still have TPDK against a 70/40/5 fish.

Understood.. but I was just making a point of how the same exact hand can either be weak or a monster depending on the villains tendencies with same action.

Well yes. It's pretty obvious that your hand strength should be viewed in relative terms with regards to your opponent's hand range and tendencies. The wider villains range, the more worse hands that will continue, the strong our hands like Top Pair become.