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How many miles are on the vehicle?
How old are the suspension parts?
There are a number of options on struts and shocks for this car that would definitely smooth out the ride.
What sort of ride does it have now? Too stiff? Too noisy? Too bumpy?
The first thing that causes road noise is tires.
How old are the tires?
If the shocks (rear) and struts (front) haven't been replaced in about 30k miles then that would be a good place to start.
Monroe OESpectrum is the best brand to offer a smooth ride and longest life on these vans-
In the rear you also have the option of KYB shocks, but they tend to be a little stiffer.
Goodyear is probably the quietest tire you could get, other than maybe some of the Generals, but they are so soft that occasionally the performance is a little squishy.
I would start with shocks and struts and then check the tie rod ends and ball joints for damage to make sure nothing is loose causing excessive jouncing from the road.
I wanted to see if you need any more help with this one.
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