The T1 platform, otherwise known as GMT-T1 or T1XX, is a General Motors vehicle architecture designed for pickup trucks and body-on-frame SUVs.

The T1 platform replaces the GM K2 platform and made its debut on the 2019 Chevrolet Silverado and 2019 GMC Sierra.

Applications of the T1 platform include:

Chevrolet

• Fourth-generation 2019 Chevrolet Silverado and newer
• Fifth-gen 2021 Chevrolet Tahoe and newer
• Twelfth-gen 2021 Chevrolet Suburban and newer

GMC

• Fourth-generation 2019 GMC Sierra and newer
• Fifth-gen 2021 GMC Yukon / 2021 GMC Yukon XL and newer

Cadillac

• Fifth-gen 2021 Cadillac Escalade / 2021 Cadillac Escalade ESV and newer

AVAILABLE AXLE RATIOS 

3.23 (5.3L w/8-spd., 6.2L and 3.0L)
3.42 (2.7L, 4.3L, 5.3L w/6-spd., 5.3L w/8-spd. and Max
Trailering Pkg. and 6.2L w/ Max Trailing Pkg.)
3.73 (avail. 5.3L w/6-spd.)