2021 3.0 transmission service interval

[Cobraracer]

Hi all,

This is my first post here and I apologize if it's not in the appropriate thread. My question is how often should I replace transmission fluid and filter? I've talked to some local mechanics including GMC dealership and I'm getting conflicting Info. What are your thoughts and recommendations? Thank you!

 

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[TonyAT4]

Welcome to the site. Do you tow with your truck? The service intervals in the manual can be followed based on usage. For me, I don’t like running past 50k on trans fluid (pull a 7k boat trailer 4-5 times a year).
GM has made it pretty difficult to diy the trans service. My last truck, 10sp 5.3 Trailboss, I brought to the dealer for the service- they ran 24 quarts thru on a flush and advised against changing the filter.
Preventative maintenance is always cheaper in the long run. The tricky part is finding a dealer/ mechanic you can trust.