I have 4 dodge caravans. Everyone one of them does this we take it on the freeway get up over 60 mph and it will kick back around. I'm serious it will work fine after. Everyone can do this. I run a small taxi business and we only use dodge caravans.
Your power steering hoses are custom length per application. Meaning your Caravans' hoses fit only Caravans with same engine, etc. If your contemplating using some other PS hose from some other car that's kind of a "****-shoot". Hoses vary from fittings sizes, types of fittings, ID of hose and thickness of hose. You might want to check local parts store for exact replacement.
Depends what you mean. Is your speedometer not working? Wheel speed sensors on Caravans are mounted at the wheels, at the end of the axle shafts. A problem with Caravans that I see alot of is the circuit board for the instrument cluster. The solder joints for the wire plug usually crack making a bad contact for the two black wires connecting to it. Just resolder ALL the terminals for this wire plug. Engine speed sensors like crankshaft postion is mounted on the bellhousing of the transmission and camshaft position sensor mounts to the top of the timing case cover, in which the bottom of the sensor is positioned above the camshaft sprocket.