1) Could be a stone or something similar between the pads and disks on your front brakes. Wheel off check the disks are they pitted, rusted or scored. Look for stones or grit between pad and disk.
2) Could be a wheel bearing, jack up the car (Securely) see if there's any play in the wheels. Try to rock them side to side and top to bottom. If there's play (movement/judder) from the hub, your bearing needs replacing.
SOURCE: im getting a grinding noise from the under side of
It could be an axle bearing. Does it only do it when you apply the brakes or does it do it just going down the road. If it does it when applying the brakes then it is in the brakes, check everything and insure that it is correctly install and that they are not hung up wearing out the pads and rotors. If it does it while going down the road and not when brakes are applied the it is probably a wheel bearing or an axle bearing. Jack up the truck and support on stands, turn the wheels and see if you can get it to recreate the noise by turning the wheels.
SOURCE: 99 dodge ram that jerks between 40 and 50 mph
Bring it back to the transmission shop and have them test drive it with the scanner to see if the Throttle Position Sensor (TPS) needs to be replaced. A worn TPS will case the transmission to have shifting problems, the TPE sends voltage signals to the PCM and will control the transmission shift points and firmness. If the TPS has a flat spot and the voltage is down at the point where the transmission needs to shift, there may be a conflict of shift program and needs to be addressed. Good luck and keep me posted.
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