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Old 06-16-2017, 04:29 PM   #1
Throbbin Rods
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Join Date: Nov 2009
Location: Lebanon, New Hampshire
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2005 Yukon Denali Transmission issue

My Denali has the 6.0, I believe that is the 4L65E. Truck has 120,000 miles. Seems like there is a lag and possible slip between shifts when driving normal. seems better when I pour the coal to it. Wondering if anyone has a thought on this. My guess is maybe the PWM solenoid or maybe even a bad clutch pack. Are any of the transmission additives of any value whatsoever or are they just motor honey?
Thanks for any thoughts
Bill
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