2021 Gmc Sierra 1500 Slt Electric Interior, Transmission Changes – With the new age group of the actual pickup truck available for 2021 time of year, the 2021 GMC Sierra 1500 is usually not delivering lots of upgrades. The forthcoming model may well not have as many choices as we will like, consequently this might be a sector where by the vehicle may possibly broaden. Additional features and potentially more trim amounts are generally all we could get from the 2021 model.