Transmission, 8 speed automatic, 8L90

Years 2015–18, 2022–23 Models 4 Factory citations 14

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Also described as Transmission, automatic, 8 speed, 8L90Transmission, 8 speed automatic

Also documented for Cadillac Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2017–2018, 2022–2023 Factory-verified

printed only in the Upfitter lists shared with the Express

GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.8.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.16.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.14.

Sierra — K2XX (2014–2019)

2016–2018 Factory-verified

the Denali guide marks it new for 2016; the 2017 manual names it 8L90.

GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.23.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.89.

Yukon — K2XX (2015–2020)

2015–2017 Factory-verified

Denali: S; the 2015 guide gives it to vehicles built after 5 October 2014; the 2018 guide gives the Denali MF6 in its place

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.23.

Yukon XL — K2XX (2015–2020)

2015–2017 Factory-verified

Denali; SLE, SLT: not available; 2015: only on vehicles built after 5 October 2014

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.23.

This page aggregates every documented appearance of M5U in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.