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About ze3bar

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  • Name
  • Location
    Sherwood Park
  • Drives
    2018 Chevrolet Silverado LT Z71
  1. I have been having issue with mine since the day that I bought it. Terrible up-shifts up to 4th gear, harsh 3-2 downshift. It has been the worst experience. I bought the truck with 14 km on it. I drive very nicely. It has about 35k on it now, and I read somewhere that adding Lucas transmission fix to the 6L80 seems to smooth it out so I tried it and it seems to be working. My issues have been worse when cold, and this morning when I drove my truck it was much smoother than before. 1-2, 2-3, and 3-4 were smoothed out and 3-2 didn't throw me forward as usual. I don't know if this would help anyone else but I thought I would mention it to see if someone else is willing to try it and confirm my result.
  2. Sherwood GMC was able to fix my problem. They had a TSB they did and it fixed the problem. They said the cleaned, oiled, and re-torqued the rear suspension and U bolts. When I drove it home, it felt like a totally new truck and the squeak has not returned.
  3. I disabled the V4-V8 on my truck and I haven't noticed the vibration since. I do have the RX can mounted on the brake booster.
  4. I don't mean to revive a dead thread. I have a 2018 LT Z71 that has the exact same issue, and i can duplicate it by rocking the truck back and forth and going over bumps at slow speeds and in and out of my driveway. the noises started when the truck had 1000 km on it. Did anyone find a resolution?

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