Custom external transmission harnesses available upon request. Made to order per customer specifications. (1K, 2K, 3K, 4K, B500, some ATEC models)

Pigtail Repair Kits Contain The Following Pre-Wired Connectors

  • Main Transmission Connector
  • Speed Sensor Connectors
  • Retarder Solenoid Connector (if applicable)
  • Retarder Temperature Sensor Connector (if applicable)
  • Accumulator (Air) Solenoid Connector (if applicable)
  • TCM Terminal


  • Pigtail repair kits installed in 2.5 hours or less
  • Eliminates intermittent wiring shorts or opens to transmission
  • Wires are labeled with wire number, TCM pin number, transmission pin number and wire description
  • Eliminates the need for multiple test drives to isolate wiring shorts or opens
  • Uses Allison wire color code
  • Kit includes pigtail wiring schematic and instruction sheet
  • Increases billable hours, reduces comebacks

Visual Quote Builder

3000 & 4000 Harnesses

Wiring Harness Request Form

Want to speak to someone? Contact Bob Snell at 714-334-9891 or, or Jim Peek at