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I bought this 15 yukon denali with 39000 miles about 3 years ago. My wife daily drives it pretty easy. It starts shifting clunky it seems every 6-8 months and goes to the dealer. 4 of the 5 times the dealer says it need the software updated which lasts for awhile bit time before last a different dealer in California did the Mobil 1 flush and it worked for what seems the longest period. It is doing it again at 90000 miles and the warranty expired in August is there any aftermarket fix , programmer, torque converter ? At this point the service advisor just tell me there is only so much they can do and seem like they are just waiting for the warranty to be up. Any help would be appreciated ! Thanks, Kris
602-672-0533
 
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