FWIW, Chrysler says 7 years or 105k miles.
Chains (applies to 2.7 only) - though many here have opinions, it's hard to say. The chain itself is seldom the problem, but the water pump can be, as well as the peripherals, like tensioner and guides/tensioner arm. Of course, though, if you're doing the water pump pre-emptively, arguably you should consider doing the chain. I waited until 207k miles to do my 2.7 chain, water pump, oil pump, and valve stem seals - water pump was as smooth as silk, no play, and not a speck of residue in the weep hole - but I'm a sample of one and may just have been lucky. But waiting on the belt for 3.2/3.5 is definitely *not* a worthwhile risk.
Jimbo - Back to your 3.2: Definitely also replace the timing belt tensioner pulley (bearings wear out). There is a hydraulic tensioner that only rarely gives problems. Many here tend to agree that you should replace that every 2nd timing belt change. Or if you want to be more sure and you think it's worth $50 to $100 more in parts cost, replace it every time you do the timing belt (of course always a risk that the new replacement could be shorter-lived than the original one with miles on it).
Also a good time to change both rad. hoses, the two accessory belts and their two (1 each) tensioner pulleys (again, their bearings wear out), and the t-stat (recommend OEM only, and test it in a pan of water on the stove before installing - sometimes they are bad right out of the box - they are a moderate PITA to R&R so you don't want a do-over).
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
Last edited by peva; 01-26-2012 at 12:36 PM.