My truck runs great. She is about to pas 300,000 miles. I haven’t serviced the trans since she hit 150. Should I change the filter and fluid at this point? Also, what else should I do.
There are pros and cons to changing your transmission fluid and filter at this point. If your transmission has worn down in some areas, the older transmission fluid may be better at stopping potential leaks and helping the transmission build pressures the way it needs to while switching gears. Putting in new fluid will clean the transmission, and you may suddenly have more wear and tear with normal use. Chances are you will need a new transmission eventually, so you may not want to speed up that process. However, if you are having issues with shifting, you will need to change the fluid and inspect the unit.
Keep up with regular oil changes, and use a quality synthetic oil designed for high mileage. Inspect the suspension, check the alignment, rotate your tires, and make sure your electronics are working well. These include your battery, alternator, ignition system (spark plugs, coils, wires), and air intake sensors. Lastly, make sure your cooling system is working well.
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