Tremec TKX GM 5-Speed Performance Transmission – 3.27 First Gear / .72 Overdrive – TCET18083

Compact high-strength manual transmission engineered for aggressive street performance, road race builds, and pro-touring applications.

The Tremec TKX platform is designed specifically for aftermarket performance vehicles requiring high torque capacity, elevated RPM shift capability, and improved transmission tunnel clearance.

This ratio configuration features a deeper 3.27 first gear for strong acceleration and a .72 overdrive suited for performance-focused cruising, making it well suited for vehicles prioritizing launch performance and close-ratio driving feel.

Transmission Configuration

• GM TKX case pattern
• 26-spline input shaft
• 31-spline output shaft
• Single overdrive 5-speed design
• Compact low-profile aluminum housing

Gear Ratios

1st — 3.27
2nd — 1.98
3rd — 1.34
4th — 1.00
5th — 0.72

Torque & RPM Capability

• Rated for 600 lb-ft torque capacity
• Supports engine speeds up to 8,000 RPM
• Designed for performance shifting near 7,500 RPM

Design & Performance Engineering

Three-piece aluminum case construction increases structural rigidity

Compact end-loaded architecture improves transmission tunnel clearance

Multi-cone synchronizers provide smoother high-RPM gear engagement

Internal three-rail shift system improves shift precision and durability

Wide gear face width increases gear life and torque capacity

Alloy steel gears and shafts manufactured from ASTM 4615 material

Caged needle bearings reduce friction and gear end-play

Optimized gear geometry helps control noise, vibration, and harshness

Integrated reverse light and cruise control safety switch provisions

Fitment & Installation Advantages

Multiple shifter location provisions for improved interior positioning

Designed to fit many performance applications with minimal tunnel modification

GM-specific case configuration for proper drivetrain alignment

Integrated transmission mount pattern provisions

Technical Specifications

Transmission Type — 5-Speed Manual Overdrive
Torque Capacity — 600 lb-ft
Input Shaft — 26 spline
Output Shaft — 31 spline
Case Construction — Aluminum 3-piece housing

Instructions

Tremec TKO & T-56 Installation Instructions