Rooster2000
TYF Newbie
- Joined
- Aug 3, 2026
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I just fixed this problem on my 2021 yukon denali 6.2l with a tube of lubeguard instant shudder fixx. I had the same issue on my Jeep and this product worked great on it so I figured I would try it out for the Yukon. The problem with the Yukon is it doesn’t have a transmission dipstick in the engine bay. I put ramps under the front and rear tires of the driver side and drove it up to tilt the vehicle. With the engine running and up to temperature I opened the 8 mm hex fill plug with an allen wrench (which took some effort; cheater bar was needed) and squeezed the tube into it. Then I applied thread sealant to the fill plug and put it back. It worked great and there’s no more shudder.
