Detroit Speed Level 3 Full Vehicle Kit, Small Block Chevy and LS Engine, 4.11 154005-411-DDS

The Detroit Speed Level 3 Full Vehicle Kit represents the highest level of suspension performance for C2 and C3 Corvettes. Designed specifically for dedicated competition vehicles, it provides the adjustability and durability required for autocross, track days, and high-horsepower applications. 

With double adjustable coilovers, REM-polished ZR12 gearing, and 1200 HP-rated CV axles, the Level 3 allows drivers to fine-tune handling characteristics to match driving style and track conditions with confidence. 

ENGINEERED FOR THE DEMANDS OF COMPETITION 

Elevate your Corvette into a class of its own with the Level 3 - Detroit Speed’s purpose built integration of the Fabricated mount SpeedRay™ Front Suspension and DECAlink™ Rear Suspension. Engineered for drivers who demand handling precision, this competition minded suspension package sharpens every input, and maximizes mechanical grip. 

At the front, the SpeedRay™ system delivers a fully engineered coilover conversion paired with crisp rack and pinion steering and premium Corvette hub pack uprights. This assembly recalibrates suspension geometry for uncompromising track performance - sharper turn in, reduced chassis movement, and the planted, predictable frontend bite needed to attack apexes with confidence. 

The DECAlink™ rear suspension completes the package with a true multilink architecture and coilover conversion, optimizing stability and traction under sustained lateral load. Its integrated CV axle kit provides a clean interface with the ZR12 IRS Differential - available in 3.55, 3.73, or 4.11 ratios - while REM polished gears further enhance driveline efficiency and durability under race level stress. 

Bringing it all together, double adjustable coilovers allow precise tuning for grip, balance, and weight transfer - whether dialing in for sprint sessions or long distance endurance days. With elevated feedback, consistent response, and a remarkably composed ride even at the limit, the Level 3 transforms your Corvette into a modern, competition ready platform. 

LEVEL 3. COMPETITION-BUILT CONTROL, MAXIMUM TUNING RANGE.

The Detroit Speed Level 3 is the top-tier package for drivers who build with a stopwatch in mind. It is engineered for dedicated competition use where grip, stability, and repeatable performance matter more than comfort, and where the ability to fine-tune the chassis is part of the program. 

Level 3 is about maximum control and adjustment. It gives you the tuning range to match the vehicle to tire compounds, track surfaces, and changing conditions. Turn-in is sharper, responses are faster, and the chassis stays locked in under hard braking, aggressive transitions, and sustained cornering loads. It is designed to stay consistent when the pace goes up and the heat cycles add up. 

This series is also built for serious durability. The components and architecture are selected to handle repeated high-load use, with the strength and reliability needed for track days, autocross, and sustained competitive driving. 

If you want Detroit Speed engineering at its most focused, Level 3 is the package that turns chassis tuning into a real advantage.

FEATURES & BENEFITS 

• Complete Competition-Level Suspension System – Engineered as a unified front and rear package. 

• SpeedRay™ Front Suspension with Fabricated Mounting – Increased structural rigidity for track environments. 

• DECAlink™ Independent Rear Suspension – Multilink geometry for superior cornering stability and articulation. 

• Double Adjustable Coilover Shocks – Independent high and low speed rebound tuning capability. 

• ZR12 IRS Differential with REM Polished Gears – Enhanced efficiency, reduced friction, and improved durability. 

• Choice of 3 Gear Ratios (3.55, 3.73, 4.11) – Tailored acceleration and track performance. 

• 1200 HP Rated CV Axle Shafts – Maximum durability for high-horsepower builds. 

FITMENT NOTES

FITS: 

• 1963–1967 Chevrolet Corvette (C2) 

• 1968–1982 Chevrolet Corvette (C3) 

1963–1967 Vehicles: 

• Minor floor modification required in battery/storage compartment area for DECAlink™ clearance 

1968–1979 Vehicles: 

• No body modifications required 

1980–1982 Vehicles: 

• Stock differential not compatible with DECAlink™ 

• Requires Detroit Speed ZR12 or 1963–1979 Corvette differential 

• Requires installation of 1968–1979 rear crossmember 

• Contact Detroit Speed tech line for installation details 

ADDITIONAL NOTES: 

• Corvette frame not included 

• ZR12 differential included 

• Designed for competitive builds up to 1200 HP 

ITEMS INCLUDED