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How often do you change the transmission fluid

(2003 GMC Yukon Denali)
in Toledo, OH on July 14, 2017
I would like to know how often mileage wise to change the transmission fluid in my 2004 Yukon Denali. I am at 206k and I am unsure when the last time it was serviced for that.
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Popular Answer
on July 14, 2017
Considering the high mileage > 'Strongly' recommend only draining the old fluid by removing the transmission pan, replace filter and install pan - then refill transmission to proper level using GM recommended transmission fluid!
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of Dan R's Automotive on July 14, 2017
Every 60,000 Miles or looks or smells funny . Also Filter service every other so at 120,000 miles - We use a machine that flush's 16 quarts out and install all new Synthetic . Most shops do not do this.
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