GMT T1XX platform


The GMT T1XX is the assembly code for a vehicle platform architecture developed by General Motors for its line of full-size trucks and large SUVs that has been announced to start production in the fall of 2018 for the 2019 model year. The "XX" is a placeholder for the last two digits of the specific assembly code for each model. As an example, the project code for the Suburban is T1YC. The platform replaced the GMT K2XX series that was introduced in April 2013 for the trucks, followed by the December 2013 production of large SUVs.
The vehicles are expected to make some use of aluminum body panels as a weight-saving measure.
Production of the pickups was introduced in January 2018 with a preview of the 2019 model year Chevrolet Silverado, followed by GM's full-size sport-utility vehicles that were introduced in 2019 for the 2021 model year that went on sale in the spring of 2020. In line with GM's plan to reduce its total number of platforms to four by 2025, the T1XX platform is also expected to include an eventual replacement for the current model of Chevrolet Express which has been in production since 1995 based on the GMT 600 platform.

Vehicles

Basic platformYearsModelNotesCodeIntroductionProductionSale
GMT1XX2019-Chevrolet SilveradoRegular Cab
Double Cab
Crew Cab		GMT1RC
GMT1EC
GMT1CC		January 2018Silao
Fort Wayne
Flint		Fall 2018
GMT1XX2019-GMC SierraRegular Cab
Double Cab
Crew Cab		GMT1RG
GMT1EG
GMT1CG		January 2018Silao
Fort Wayne
Flint		Fall 2018
GMT1XX2019-Chevrolet Silverado HDRegular Cab
Double Cab
Crew Cab		GMT1HCJanuary 2018Silao
Fort Wayne
Flint		June 2019
GMT1XX2019-GMC Sierra HDRegular Cab
Double Cab
Crew Cab		GMT1HGJanuary 2018Silao
Fort Wayne
Flint		June 2019
GMT1XX2020-Chevrolet Tahoe4-door SUVGMT1UCDecember 10, 2019Arlington December 2019Spring 2020
GMT1XX2020-GMC Yukon4-door SUVGMT1UGJanuary 14, 2020Arlington December 2019Summer 2020
GMT1XX2020-Cadillac Escalade4-door SUVGMT1ULFebruary 4, 2020Arlington December 2019Fall 2020
GMT1XX2020-Chevrolet Suburban4-door extended SUVGMT1YCDecember 10, 2019Arlington December 2019Spring 2020
GMT1XX2020-GMC Yukon XL4-door extended SUVGMT1YGJanuary 14, 2020Arlington December 2019Summer 2020
GMT1XX2020-Cadillac Escalade ESV4-door extended SUVGMT1YLApril 2020Arlington December 2019Fall 2020