ok im going to give u the sound im getting from our 00 minivan springs or struts.
car just hit 25,000 miles. when the car goes and when u hit a bump or normal road the car sounds fine. if you drive it and the front of the car like moves down or bounces down the car sounds like 2 people having sex in bed and the springs are bad in the mattress. i know it sounds wierd. the springs on a bed like a irky irky sound of the car moving up and down. seems like it sounds worser in the winter than summer or spring. can this problem be the struts or does this car have a sway bar that could be cracked.
I would check the sway bar. They like to break at the ends where the links hook in. Also, I have chased some bastard clunks in those vans down to sway bar bushings many times. That would be my guess, the bushings. I would change those and the links.
All of the vans I did the work to had 25-50K miles on them too.
very common problem for NS vans is the sway bar bushing brackets.the top part that hooks into the frame has movementand causes a creak.If this was the source of the noise taking them off and clean/lube them usually does the trick.then theres links and bushings cause clunks,Also a dry sway bar joint or tie rod.it could be any one of those.yu need to have some one rock the van so you can pin point it