I changed the differential fluid in by 2021 Yukon Denali three times and the groaning noise from limited slip diff still persisted. I then used the Yukon Gear and Axle
Friction Modifier Positraction Additive for Limited Slip Differentials
Problem solved. The noise disappeared immediately.
Thank you thank you thank you. I was just about to call a tow truck when I read the post about the floor mat holding the accelerator down. I just washed the truck including the floor mats and put them back in. As soon as I read this, I went out and checked sure enough the floor mat was holding...
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