When was the last time you had your transmission fluid changed? Was it more than 30,000 miles ago? If so you should get it changed sooner rather than later. If it has been a long time, please make sure that a qualified technician checks it before it is changed. If the fluid if really dirty and burnt, you probably are going to want to leave it, especially if the vehicle has high mileage. Why? Because over time the fluid breaks down and form a type of shellac on the interior of the transmission. If you take out the old fluid and put clean fluid in, the clean fluid is going to act as a detergent and clean the shellac off, and at this point it could cause major damage, including losing the transmission. This is why we recommend replacing your ATF every 30,000 miles, before it gets dirty, to prevent this from happening. We want your transmission to run smoothly for years, and years. As far as the cost of the service, it’s really going to depend on the year, make and model of your vehicle. Give us a call, and we will answer this question for you.