One problem related to transmission noise has been reported for the 2017 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 GMC Sierra 1500 based on all problems reported for the 2017 Sierra 1500.
I bought this truck used with 12,918 miles on it, April 2018. When driving(especially on highway), and changing speeds, transmission clunks and lurches-automatic transmission. It sounds and feels as if drive train will fall out. I have taken it to dealer twice. The first time, they kept it for 3 days, the second time, for one. The mechanic is able to replicate the noise/lurching, but they are unable to find a cause or correction. They tell me it is not dangerous, but I am concerned that the noise/movement, could cause myself or another family member to swerve or brake hard and cause an accident. The mechanic has tried "updating the software" but that did not fix it. Several other GMC sierra owners tell me they have had same problem.