Introduction

Of all the fluids that need changing — engine oil, differential gear lube, transfer case fluid — transmission fluid was always the one I dreaded most. On some cars it's easy, but on many it's very inconvenient. It often requires you to drop the pan entirely and becomes a messy and complicated ordeal. Thankfully, there's a solution to the problem — at least for most vehicles. The trick is to work from the top, sucking old fluid up and out through the filler tube and then refilling it with fresh fluid. This procedure takes less than an hour and you don't have to worry about getting under the car or covered in transmission fluid.

As I mentioned, this technique will work on most vehicles. However, some vehicles have transmission filler tubes that won't allow the extraction hose to fit all the way down into the pan.

When To Call a Pro

If your transmission is still shifting slow or slipping even after new fluid has been added, this may be an indication the bands or clutch plates within the transmission are going bad. It could also indicate faulty or sludgy shift solenoids. Either way, it's time to talk to a transmission specialist.

About the Expert

Jay Cork, a self-taught mechanic and former manager of an O'Reilly's Auto Parts store has had his hands covered in transmission fluid more times than he cares to count.

Tools Required

Materials Required

• Fluid extraction pump
• Shop towels
• Transmission fluid (confirm with your dealership if unsure of your vehicle's type)