Chuck, if it ain't broke, don't fix it... Seriously, stay up on the maintainance and fluids, drive sanely, listen for things that go bump in the night (or squeak, grind or whine). Have the suspension checked as well. You could go crazy replacing stuff if you so desired. Just my humble opinion.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.