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Old 06-20-2019, 08:20 AM   #5
rpmerf
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Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
Re: Controversial 4l60e maintenance question

I changed the filter and fluid on my 200K+ mile 97 Burb about a year ago. Didn't flush, just replaced what came out. Really helped downshifting. Before it would take a solid 3 seconds to downshift @ WOT, now it downshifts closer to what I would consider normal. I believe the truck was well maintained before I got it, but I am not sure the last time the fluid/filter was changed. The fluid looked good before I changed it.
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