Well I got the crappy 3.0 engine and just found out it has a timing belt. Not sure how to tell if the timing belt has been changed? Paid $1600 for this van and am just going to drive it till it dies, then junk it. So far it runs and sounds like a purring kitten. I'm very surprised at how well it does, though it does burn a bit of oil, though not enough to see the white smoke.
So far I did have to put new spark plug wires, air filter, radiator, fuel pump and a few more odds and ends. Normal mainten. for a high mileage van. Best of all it still looks pretty good and it's a vehicle my wife can have for all her messy junk and the two kids. This, instead of trashing my Avalanche.