2018 gmc sierra 1500 transmission problems with 14 complaints from sierra 1500 owners. The worst complaints are hard shifts, shuddering, and hesitation, surging. nov 24, 2023 · no relationship with new dealer yet. I noticed the tcc shudder a couple of months ago. I did the transmission triple fluid flush and dropped the pan to change filter. nov 3, 2023 · i have a 2018 gmc sierra with 6. 2 and the 8 speed 8l90 transmission. Before 19,000 miles i got the shudder. I did an online search to see if others. dec 18, 2020 · the 2018 gmc sierra 6 speed transmission has had reported problems from consumers such as transmission cooler line leak, harsh shifting, and transmission stuck. nov 27, 2018 · i have had my 2018 silverado lt crew cab z71 for about two months. It has the 6 speed automatic transmission. It hesitates, lags, wanders and is woefully. dec 1, 2019 · the worst situation is low speed downshifting and the transmission seems to upshift momentarily and results in a pushing sensation and if we're not careful the truck.
