Speartech STE-LS3-T56/TKX LS3 Crate Engine Standalone Wiring Harness T56 TKX Manual Transmission

The Speartech STE-LS3-T56/TKX is a purpose-built standalone wiring harness package designed for LS3 crate engine swaps paired with a T56 or Tremec TKX manual transmission. Engineered by the industry's leading LS swap harness specialists, this kit simplifies the wiring process for engine swap builds by eliminating the complexity of the factory chassis harness.

Key Features:

• Designed specifically for Gen 4 LS3 (58x) crate engine applications
• Compatible with T56 and Tremec TKX manual transmissions
• All connectors are clearly labeled for easy installation
• Built and tested on a live engine and transmission setup before shipping
• Covered in Speartech's exclusive heat-resistant woven fabric loom for a clean, professional finish
• Includes pre-cat O2 sensor wiring for proper engine operation
• Standard configuration includes no emissions wiring (post-cat O2s, purge, EVAP) — emissions options available
• Optional MAF sensor integration (LS3/LS7 style)
• Air conditioning support for GM A/C compressor
• ECM reprogramming option available to match your specific engine build, gear ratio, and tire size

Speartech harnesses are built to order, allowing for full customization to accommodate aftermarket intakes, superchargers, unique sensor placements, and other modifications. With over two decades of LS swap harness manufacturing experience, the STE-LS3-T56/TKX delivers a plug-and-play solution that is ready to run right out of the box.