The most obvious sign that it is time to change your transmission fluid is a warning light on the dashboard. Other signs may include the car's engine revving when you accelerate or go around corners, difficulty shifting, a chattering noise when you start driving, a slight burning smell or a puddle under your car. Like always, if you are uncertain about a noise, leak or feeling, we encourage you to bring your vehicle to us here at 625 Auto Repair in Mohnton.