Axle, rear, 2.85 ratio

Years 2014–15, 2018–19, 2025–26 Models 4 Factory citations 19

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Also documented for Chevrolet

Documented applications

ATS — Alpha (2013–2019)

2018 Factory-verified

GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats v fleet order guide wayback, p.4.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O; on the V-Series Blackwing the guides include it only with the 10 speed automatic MHU

GM factory document — 2025 cadillac ct4 fleet order guide, p.7.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.7.
GM factory document — 2026 cadillac ct4 fleet order guide, p.7.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.9.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

Premium Luxury, Sport: S; V-Series: S; V-Series Blackwing: O

GM factory document — 2025 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 fleet order guide, p.7.
GM factory document — 2026 cadillac ct5 fleet order guide, p.7.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.8.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.10.

CTS — Alpha (2014–2019)

2014–2015, 2018–2019 Factory-verified

Vsport, Vsport Premium: S; 2019 per GM's 2019 CTS Sedan order guide (V-Sport and V-Sport Premium Luxury columns agree)

GM factory document — 2014 cadillac cts sedan fleet order guide wayback, p.4.
GM factory document — 2015 cadillac cts sedan fleet order guide wayback, p.4.
GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.4.
GM factory document — 2019 cadillac cts order guide copy gm authority, p.4.

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