It would never be worthwhile to trade in your Flex to avoid the transfer case issue if you just consider the math. It's not really that expensive to do - maybe $3000 at the most, and you'll easily lose that much on any trade-in transaction when you consider the wholesale/retail spread and sales tax.
And while there's no guarantee that you won't have the problem, the newer ones are less likely than the older ones as production processes were improved. And it's not like every single one has the issue either.
And while there's no guarantee that you won't have the problem, the newer ones are less likely than the older ones as production processes were improved. And it's not like every single one has the issue either.