Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. Uses such as high performance operation. Manual transmission fluid doesn’t require change. Loosen the plug, pull it out, and give it a nice clean. The drain plug is located on the driver's side just next to the dogbone/pendulum mount and can be easily reached from the front of the car. Get the plug nice and loose so the fluid is dripping and get your container ready to catch the fluid. Installation and Refill. Fit the new filter and apply the new gasket to the pan. Install the oil pan and do not over tighten the bolts to not crush the gasket, make the rubber do the sealing and not brute force. Use a crisscrossing pattern like tightening the lug bolts to ensure evenly distributed gasket. Personally, I like to change fluids before what's recommended and usually on intervals I can easily remember. Oil every 5k, diffs, manual trans and transfer cases every 30k and auto trans every 50k. Fluid is cheap compared to a new gearbox. Step 2. Place the catch pan underneath the transmission, then unscrew the fill plug. Fluid drains from the transmission quickly at first. When the flow of fluid has stopped, support the bottom pan of the transmission body, then unscrew the bolts. Carefully lower the detached transmission pan and empty the remaining fluid into the catch pan. This video shows step by step how to easily change your 4L60E automatic transmission fluid and filter in the 1993-2000 Chevy or GMC truck, SUV, etc. This nee Transmission fluid is a specialized lubricant in your vehicle’s transmission system. This fluid is designed to reduce friction, dissipate heat, and provide hydraulic power, making it possible for your vehicle to shift gears and transmit power from the engine to the wheels. Transmission fluid plays several critical roles in your vehicle Changing the filter changes most of the fluid, and you clean the magnet. That is plenty enough. If you REALLY REALLY REALLY must flush the fluid, you can do it yourself by removing the lower trans cooler hose and putting an old garden hose over it then putting that in a bucket. Then disconnect the fuel pump via the fuel pump relay or the Duty cycle plays a major role, in needed oil change intervals. Every vehicle that I have ever owned, including 3 Jeeps, 30,000 miles on the automatic trans, and 50,000 on transfer case and diffs. Maintaining the proper levels, are a key element to longevity!!!!!!!! MERCON® automatic transmission fluid: Caution: Be sure to use the correct type of transmission fluid. Do not mix MERCON® and MERCON® V or LV: Automatic transmission fluid capacity (dry fill) 2004-2010 Four-speed transmission: Up to 13.9 quarts: Six-speed transmission: Up to 10.1 quarts: 2011 and later: Up to 13 quarts: Note: This is a dry Nn8E.