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Oliver M (not verified)    March 2, 2025 - 11:11AM

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Hi I have owned three GMC Sierra’s so far.
My latest one is a 2017 SLT 5.3 with 8 speed automatic. Since owning the truck in 2022 with 119k in Canada, i have had this bump or thump when going into second gear also shift down to second coming to a sop or the lights.
I have changed the fluid in transmission wit Mobil 1 Blue decal the correct one and it helped but has not totally gone. Seems like Canada is not being bothered with fixing this issue. Why. I am hesitant to buy my next Denali, which is what i wanted in the first place. Five tested had a severe vibration from transmission on highway.
Thank you

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