AskPatty Certified Female Friendly Logo

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.

Answers from the Automotive Experts

Jessica Howe, Automotive Expert & Coach at AskPatty.com

Hello, 

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. 


Contribute to this question:


blog comments powered by Disqus

Related Chevrolet Tahoe FAQs


  • I would like to know how many quarts of transmission fluid my truck should have in it Read More
  • I would like to know how many quarts of transmission fluid my truck should have in it Read More
  • Can a 1998 transmission fit a 2001

    Read More
  • What is the correct reading of transmission fluid on the dip stick when running for ... Read More

  • How much transmission fluid does a 2001 Chevy Tahoe require?

    Read More
  • Had transmission put in out of a suburban...now the SECURITY LIGHT IS FLASHING AND THE ... Read More

  • My transmission seems to be shifting late or having a hard time shifting from 1st to ... Read More

  • My 2001 chevy tahoe seems to being shifting late or having a hard time shifting out of ... Read More

  • Is the motor supposed to be in neutral and runing to check transmission

    Read More

Need Car Advice?

Ask The Experts!

Looking for a New or Used Car?

Search for our Certified Female Friendly® Car Buying Marketplace locations

Help Our Charities