If the grinding sound seems to be coming from the speedometer and grinds faster as your speed increases, the likely cause is the speedometer cable. At least some 1990 Dodge Trucks (mine) have electric speedometers Len
The rear axle speed sensor is the usual cause of an inoperative speedometer.
coming to a complete stop
i would have to bet on the speed sensor
Wheel bearing?
The grinding noise in the front of a 1990 Dodge Caravan could be a cv joint. If it is, it probably only grinds when you take a sharp turn. There is one located on each side.
speedometer cable is gummed up inside the housing.Remove cable from speedometer.Pull out inner cable. Lubricate with good grease and install.
it could be a rock or your cars not funny
Possible causes of popping/grinding noises when turning:Wheel bearingsCV joint / axleBrakesSee "Related Questions" below for more
The speed sensor needs replaced. It is on the trans.
An internal failure in the axle. It will need disassembled to know the actual cause.
Noises have to be heard to be correctly diagnoised. Check the motor mounts to see if they are broken.
Most likely the VSS. Vehicle Speed Sensor. It is mounted on the side of the transmission.