New answers tagged drivetrain
Return your vehicle to the garage that carried out the work in case they need to do any rectification work, or, advise you of anything else that may be developing
Is that all they did? Sugar in your tank? Are you sure they did nothing else? That's a rear-wheel drive car, right? I think you may have lost a driveshaft balance weight. Coincidental. Unless... the vandal also loosened your lug nuts or u-joint nuts, either of which could make a car vibrate unpredictably at speed.
First thing I would check is the tank loose? If so tighten the mounting bolts. Depending on the design it should be pretty easy to jack up the car and check how loose the tank is.
This sounds like one (or both) of your u-joints is (are) bad. If the u-joint has dried out and the needle bearings are dry, when they rotate as they are supposed to, they bind/release causing a pinging noise like you are describing (it reverberates through the hollow drive shaft). The reason you only hear it at lower speeds is because the road noise covers ...
You will need to inspect your driveshaft for security from front to rear, bolts, joints, brackets and for any damage. Are you sure the pinging is from your driveshaft? Pinging is normally associated with engine pinking, especially when accelerating from a low speed.
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