Transmission Minor
Gear selector and linkage, transmission computer, transmission sensor or solenoid, clutch adjustment, rough shifting, slipping transmission, leaks.
What Owners Say
"Going down the road and the truck would shudder. It started when it had around 40,000 miles on it. This is a known issue with GMC trucks and their bandaid fix is to change the transmission fluid and filter and add additives to it. So far, it is working."
Anonymous A., MS (2018 GMC Sierra 1500 SLT 5.3-L V8)"The 8 speed transmission would shudder under low RPM while under 8 cylinder operation. No shudder occurs while in 4 cylinder operation (active fuel management). Hard downshifts occurs when accelerating and shifting from 4 cylinders to 8."
Anonymous, NH (2018 GMC Sierra 1500 SLT 6.2-L V8)"Mainly after sitting overnight, the initial shifting through the gears is when the problem occurs. Then it shifts as expected. Had transmission flushed and fluid replaced with synthetic. Still occurring."
Anonymous, IL (2018 GMC Sierra 1500 SLT 5.3-L V8)"Sierra is known for transmission issues. GMC seems to be sweeping it under the rug- rough shifting on start off and also between 35 to 50 mph apparently wrong transmission fluid was put in at factory. GMC says the cure is to flush the transmission -that helps initially, but eventually transmission has to be replaced, wish CR could look into it"
Anonymous, AL (2018 GMC Sierra 1500 SLT 5.3-L V8)"Transmission had shimmering every 10-15 seconds while driving. It helped after a transmission flush."
Anonymous, TN (2018 GMC Sierra 1500 SLT 5.3-L V8)"Happens the same as the rough shifting after sitting overnight or for a long period of time."
Anonymous, IL (2018 GMC Sierra 1500 SLT 5.3-L V8)
"GM used the wrong transmission fluid for a few years apparently, which was the cause of the vibration. I took it into the dealership before any more damage was caused so a simple transmission flush and replace with correct fluid solved the issue."
Anonymous A., SC (2018 GMC Sierra 1500 SLT 5.3-L V8)