N8X Factory-verified

GMC · Regular Production Option

Transmission, automatic, 8 speed, 8L90, Gen 2

Years 2024–27 Models 1 Factory citations 12

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Also documented for Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2024–2027 Factory-verified

the 2024–2026 Upfitter lists give 8L90, Gen 2; the 2025–2027 guides read Transmission, 8-speed automatic, heavy-duty, electronically controlled, with overdrive and tow/haul mode, and require the 6.6L V8 (L8T); S: Cutaway 2WT (2025–2026), Cutaway TG33803, Cutaway TG33903 (2025–2026); O: Cargo 1WT, Cutaway TG33503, Passenger 1LS, Passenger 1LT

GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.12.
GM factory document — 2025 gmc savana cargo fleet order guide, p.33.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.41.
GM factory document — 2025 gmc savana passenger fleet order guide, p.25.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.
GM factory document — 2026 gmc savana cargo fleet order guide, p.35.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.45.
GM factory document — 2026 gmc savana passenger fleet order guide, p.27.
GM factory document — 2027 gmc savana cargo fleet order guide, p.32.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.22.
GM factory document — 2027 gmc savana passenger fleet order guide, p.25.

This page aggregates every documented appearance of N8X in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.