* CV Joints (Constant Velocity Joints): This is the most likely suspect. CV joints allow the drive axles to transmit power through changing angles during turning. A worn or damaged CV joint will often produce a grinding, clicking, or popping noise, especially under load (acceleration) and when the steering wheel is turned sharply. The grinding will typically worsen with the severity of the turn and acceleration.
* Differential: Problems within the differential (the gear assembly that splits power to the wheels) can also cause grinding noises, particularly under load and when turning. Worn gears, a failing differential bearing, or low differential fluid are all possibilities. You might also notice a whine or hum alongside the grinding.
* Wheel Bearings: While less likely to be specifically related to turning, a severely worn wheel bearing can produce a grinding noise that is exacerbated by acceleration. This noise is often more constant, less related to the angle of the turn, and may also feel like a vibration in the steering wheel or floor.
* Transmission: Although less common, a problem within the transmission itself (worn gears, low fluid) could manifest as a grinding noise under load, especially during acceleration. However, it's less likely to be strongly tied *only* to sharp turns.
* Brakes: While less likely to be a *grinding* noise, severely worn brake pads or rotors can produce a scraping or squealing sound which could be misinterpreted as a grinding noise, especially if the noise is only heard during turning (if one side is wearing more than the other).
Troubleshooting Steps:
1. Check the differential fluid: Low or dirty fluid is a common cause of differential problems. Check the fluid level and condition. If it's low or dirty, it needs to be changed.
2. Inspect the CV joints: Look for torn boots (rubber coverings) on the CV joints. Torn boots indicate internal damage and need immediate attention. You may even be able to hear or feel clicking or grinding in the CV joints when manually moving the axles.
3. Listen carefully: Try to pinpoint the location of the noise. Is it coming from the front left, front right, rear, or somewhere else? This will help narrow down the possibilities.
4. Jack up the vehicle: With the vehicle safely supported on jack stands, try rotating each wheel individually to listen for grinding or unusual noises. This can help identify a bad wheel bearing or CV joint.
Recommendation: Due to the complexity of the potential causes, it's strongly recommended to take your 1998 Plymouth Voyager to a qualified mechanic for diagnosis and repair. Ignoring a grinding noise can lead to more significant and costly damage. Ignoring a CV joint issue, for instance, could lead to complete axle failure, leaving you stranded.
