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11/01/2021 10:49 am
Topic starter
2016 GMC Sierra 5.3 6-speed auto 4x4
50,000 mile
Scotty, I have never changed auto transmission fluid before and I'm debating on doing it or having it done. BUT... is it even necessary? Will trouble arise if I just leave it alone? It still looks clean on the stick and transmission works flawlessly. However, the manufacturer suggest changing it every 45k miles. Same with transfer case and differentials.
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11/01/2021 11:48 am
Yes, to get the most life out of the transmission. Scotty even mentions in the past to change every 30,000-40,000 miles so 45,000 miles you mention is OK. Even for “lifetime” transmissions you’d want to do that. Drain and Fill only, don’t Flush!
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11/01/2021 4:58 pm
if you have to do it every 5 years it's not the end of the world
